Module 9-Activity 5: Reflect

 A said ‘if length of a rectangle is increased by 1 and breadth decreased by 1 the area enclosed by the rectangle remains the same’. B said ‘No, A is wrong as the new area will increase’. C said ‘No, A and B both are wrong, the new area will decrease’. How will you handle this situation?

Comments

  1. Thinking is necessary to reflect inner idea to put solve math.

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  2. Teacher should explain students what they should be careful about in image based question in details. Teaching should be done in using visual aids.

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    1. Yes can explain through different teaching activities.

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    2. Sure sir teacher should explain perfect ly to students.Then they will do the sum

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  3. First of all I'll teach them correct formula and go again through. Then a visual aid might help in handling the situation.

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  4. It area of the rectangle may increasee or decrease.

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  5. Teacher should explain students what they should be careful about in image based question in details. Teaching should be done in using visual aids.

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  6. I'll teach them correct formula and go again through. Then a visual aid might help in handling the situation.

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    1. Teachers should make every students doubt clear with deliberation. They should make them note down proper formulas of particular chapters.

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  7. ଏଠାରେ, ଉଭୟ A ଏବଂ B ଭୁଲ ଅଟେ |
    ଯଦି ଆୟତକ୍ଷେତ୍ରର ଲମ୍ବ ଏବଂ ପ୍ରସ୍ଥ ଯଥାକ୍ରମେ 1 କୁ ବୃଦ୍ଧି ହୁଏ ଏବଂ ହ୍ରାସ ହୁଏ, ସ୍ୱୟଂଚାଳିତ ଭାବରେ କ୍ଷେତ୍ର ପରିବର୍ତ୍ତନ ହେବ ..
    ଯଦି ଏକ ଆୟତକ୍ଷେତ୍ରର ଦ୍ରଘ୍ୟ 5 ମିଟର ଏବଂ ପ୍ରସ୍ଥ 3 ମି, ତେବେ ଏକ ଉଦାହରଣ ନେବା, ତେଣୁ କ୍ଷେତ୍ରଟି ଲମ୍ବ x ପ୍ରସ୍ଥ = 5m x 3m = 15m = ----- (A),
    ବର୍ତ୍ତମାନ ଯଦି ସମାନ ଆୟତକ୍ଷେତ୍ରର ଲମ୍ବ 1m ବଢାଇବା ,ଅର୍ଥାତ୍ 5 + 1 = 6 ମିଟର ଏବଂ ପ୍ରସ୍ଥ 1m କମାଇବା, ଅର୍ଥାତ୍ 3-1 = 2m ହ୍ରାସ ହୁଏ, ତେବେ ନୂତନ କ୍ଷେତ୍ର 6x2 = 12m² ------ (B) ହେବ |
    (A) ଏବଂ (B) ତୁଳନା କରନ୍ତୁ, ଆମେ ଦେଖୁ ଯେ ମୂଳ କ୍ଷେତ୍ର ହେଉଛି 15m² ଏବଂ ନୂତନ କ୍ଷେତ୍ର ହେଉଛି 12m² ଯାହା ସୂଚିତ କରେ ଯେ ନୂତନ କ୍ଷେତ୍ର ହ୍ରାସ ହୋଇଛି |
    ତେଣୁ C ସଠିକ୍ ଅଟେ |

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  8. Teacher should explain students what they should be careful about in image based question in details. Teaching should be done in using visual aids.

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  9. Teacher should draw the rectangle with assumed length and breadth and find out the area by counting the small squares inside the triangle.
    Then by changing in their length and breadth snd find out the area on another graph paper by counting the squares.
    By comparing the learner will know the area decreases.

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  10. Teacher should draw the rectangle with assumed length and breadth and find out the area by counting the small squares inside the triangle.
    Then by changing in their length and breadth ,find out the area on another graph paper by counting the squares.
    By comparing the learner will know the area decreases...Teacher should explain students what they should be careful about in image based question in details. Teaching should be done in using visual aids.

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    1. Students can be asked to calculate themselves in group.

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  11. This situation can be handled with real time images. And examples of different rectangles

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  12. The area of rectangular may increase or decrease if the length and breadth of rectangular changed.With the help of paper the teacher can clarify the problem.then the formula and solve the problem.

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  13. Teacher should explain perfectly the area concept about a rectangle and its formula through a visual aids

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  14. A teacher should draw a rectangle. She/he should discuss 4-6 examples regarding that rectangle. 1st, she/he should take a fix length, breadth and find out the area. Then she/he should take 4-5 examples of decreasing one of them by 1 and increasing one of them by 1. Hence, the answer can be found.
    Or, they can also proof it theoretically.

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    1. Hear C is correct answer.A teacher should draw a rectangle and find its area.Then draw a said new rectangle and find its area.Now compare both areas. Next he can easily gets answer.

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  15. It can be explained through different teaching activities. Teaching should be done in using visual aids.

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  16. To handle this situation ,I will ask them to do it by themself using different TLMs and find the answer.I can also help them in need..

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  17. In this situation first of all the teacher should clerify the method of calculating the area of a rectangle by using visual aids.then the teacher may follow the method of induction by taking more than 3 examples and justify the answer.

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  18. As length is the longest side of a rectangle and according to the question the length is increased by 1 unit means the fraction of increase in length is less as compared to breadth so the area will decrease.for example,if L=100 n B= 2 so decrease in breadth by 1 means reduction by 50% but the% increase in length is much less if we increase by 1 unit.and if we change the question by increasing the breadth n decrease in length,then the area will increase.only deviation is if the difference between L & B is 1 then the area will be same.

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  19. Teacher should draw the rectangle with assumed length and breadth and find out the area by counting the small squares inside the triangle.
    Then by changing in their length and breadth snd find out the area on another graph paper by counting the squares.
    By comparing the learner will know the area decreases.

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  20. YesTeacher should explain students and Teaching should be done in using visual aids.

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  21. all the students lack practical idea. they don`t have clear idea of shape and their measurement. hence to root out their doubts a teacher should give multiple examples and take the help of ict.

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  22. Teacher should draw rectangles of different length and breadth and show the children the difference.

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  23. The new are will decrease.We can explain it by taking some example.

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  24. We should handle it by taking many examples .

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  25. 1st i would like to give a example ,let a rectangle have lenth -6cm
    And breadth 4 cm

    Then i will ask students to compare the area of both rectangles

    Govt. PS Shialikudar
    21050411001
    Duryodhan Kisan

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  26. The teacher should draw rectanglesof different length and breadth and show the children the difference.

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  27. Sarat kumar Rout,kendrapara-Teacher should explain it to the students about the actual situation.Then used visual aids/Tlm properly for clear understanding. with mathmatical proofs we solve it.

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  28. Area of rectangle
    """"''''''''"""""""""""'''''''''''''''''''''''
    First of we should allow students to explain both the situation with the help of square blocks of GKA kit. It will make easier if we shall show them the demo first and allow them to repeat in Groups and if possible than individually.
    It may help them to calculate calculate the areas in both situation and than they may compare which will be bigger in area.

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  29. Yes Sir the more they understand the clear they can explain..

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  30. ହରେକୃଷ୍ଣ ପଣ୍ଡା
    """""""""""""""""
    କ୍ଷେତ୍ରଫଳ -
    """"""""""""
    ଏଠାରେ, ଉଭୟ A ଏବଂ B ଭୁଲ ଅଟେ |
    ଯଦି ଆୟତକ୍ଷେତ୍ରର ଲମ୍ବ ଏବଂ ପ୍ରସ୍ଥ ଯଥାକ୍ରମେ 1ଏକକ କୁ ବୃଦ୍ଧି ହୁଏ ଏବଂ1ଏକକ ହ୍ରାସ ହୁଏ, ସ୍ୱୟଂଚାଳିତ ଭାବରେ କ୍ଷେତ୍ର ପରିବର୍ତ୍ତନ ହେବl
    ଯଦି ଏକ ଆୟତକ୍ଷେତ୍ରର ଲମ୍ବ 6ମିଟର ଏବଂ ପ୍ରସ୍ଥ 3 ମି, ତେବେ ଏକ ଉଦାହରଣ ନେବା, ତେଣୁ କ୍ଷେତ୍ରଟି ର କ୍ଷେତ୍ରଫଳ ଲମ୍ବ x ପ୍ରସ୍ଥ = 6ମି.x 3ମି. = 18ବ.ମି ----- (A)
    ବର୍ତ୍ତମାନ ଯଦି ସମାନ ଆୟତକ୍ଷେତ୍ରର ଲମ୍ବ 1ମି. ବଢାଇବା ,ଅର୍ଥାତ୍ 6 + 1 = 7ମିଟର ଏବଂ ପ୍ରସ୍ଥ 1ମି. କମାଇବା, ଅର୍ଥାତ୍ 3-1 = 2ମି. ହ୍ରାସ ହୁଏ, ତେବେ ନୂତନ କ୍ଷେତ୍ର 7x2 = 14ବ.ମି ------ (B) ହେବ |
    (A) ଏବଂ (B) ତୁଳନା କରନ୍ତୁ, ଆମେ ଦେଖୁ ଯେ ମୂଳ କ୍ଷେତ୍ର ହେଉଛି 18ବ. ମି.ଏବଂ ନୂତନ କ୍ଷେତ୍ର ହେଉଛି 14ବ.ମି. ଯାହା ସୂଚିତ କରେ ଯେ ନୂତନ କ୍ଷେତ୍ର ହ୍ରାସ ହୋଇଛି |
    ତେଣୁ C ସଠିକ୍ ଅଟେ |

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  31. Teacher should explain to the students

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  32. The teacher will explain it by drawing a rectangle with numerical example. If the length of a rectangle is 5 CM n bredth is 4cm, it's area is 20 sq CM. If the length increases by 1 it will be6cm n the breadth decreases by1 will be 3 CM. It's area will be 18 sq CM.

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  33. C is right.
    In order to get the students convinced following steps may be taken.
    1. Each of the students will be provided with a cardboard of rectangular size and asked to measure its length and breadth and also find out its area by multiplying the both.

    2. Then they will be instructed to draw rectangles increasing 1 in the length and reducing 1 from the breadth of the cardboard rectangles and also find the area to see the difference.
    This activity may be done twice or thrice with some other rectangles.

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  34. First of all I'll encourage the pupils to carefully observe picturical presentation of the problem and explain before them correctly about formulae and ideas relating to this problem

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  35. I would like to handle this situation by following steps:
    1- Let my children know the formula of area calculation of a rectangle which is:
    Area of a rectangle=Length*breath
    2- Then I would like to give them an example based on this question and draw 2 rectangles on black board based on the question. Like:
    👉Let the length & breath of a rectangle is 4m & 3 m respectively.
    (I will draw a rectangle on blackboard having length & breath 4m & 3m)
    👉Now ask my children to find out the area of this rectangle by putting the formula.
    Length*breath=4m*3m=12 Square meters
    👉Now I draw another rectangle having length & breath 5m & 2m(according to the instruction given in the question) and ask my children to find out it's area.
    Area= 5m*2m=10 square meters
    👉Now ask my children what they noticed?
    Wheather area decreased , increased or remained same ?
    👉Now I hope that they will dafinitely say that the area of the new rectangle decreases.
    👉Like this I would like to give them some more examples and also say them to take some more examples like this by their own for their better understanding.
    This I will make them understand that both 'A' & 'B' are wrong and 'C' is right.

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  36. It will be my first and foremost duty to form an idea about rectangles among children .There after by justifying answers of A,B and C ,I will involve them in a vivid discussion through rectangular observation .

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  37. A teacher will draw two rectangles A and B. The length of rectangle A is 5 cm and breadth is 4 cm, and the length of rectangle B is 6 cm and breadth is 3 cm..Then the teacher will divide the the students into two groups A and B. A group will calculate the area of rectangle A,, and B group will calculate the area of rectangle B. Then each group will present it in the class and the answer will be clear. In the same manner more examples can be taken.

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  38. The students will be divided into groups and given different dimensions of rectangle to each group. Ask them to find the area. A vivid discussion to be undertaken.

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  39. ପିଲାଙ୍କୁ କ୍ଷେତ୍ରଫଳ ନିର୍ଣ୍ଣୟ କରିବା ସକାଶେ ବିଭିନ୍ନ ଦୈର୍ଘ୍ୟ ଓ ପ୍ରସ୍ଥ ବିଶିଷ୍ଟ କ୍ଷେତ୍ରର ଚିତ୍ର ଅଙ୍କନ କରି ଦେବା । ସେମାନଙ୍କ କ୍ଷେତ୍ରଫଳ ନିର୍ଣ୍ଣୟ କରିବାକୁ କହିବା । ତୁଳନା କରି ଦେଖିବେ । ଯଦ୍ୱାରା ଶିକ୍ଷଣ ଦକ୍ଷତା ବୃଦ୍ଧି ପାଇବ। ଏବଂ ଦୈନଦିନ ଜୀବନରେ ପ୍ରୟୋଗ କରି କହି ପାରିବେ । ଏହି କ୍ଷେତ୍ରରେ A o B ଭୁଲ୍ । ଏଣୁ ବିଭିନ୍ନ ଚିତ୍ର ଓ ଗଣିତ କିଟ୍ ରେ ଥିବା ବ୍ଲକ୍ ନେଇ ସେମାନଙ୍କ କ୍ଷେତ୍ରଫଳ ଆଧାରିତ ଧାରଣାକୁ ଦୃଦିଭୂତ୍ କରିବାକୁ ହେବ।

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  40. ଗୋଟିଏ ଆୟତ କ୍ଷେତ୍ରର ଉଦାହରଣ ନେଇ ତାହାର କ୍ଷେତ୍ରଫଳ ନିଆଯିବ ଏବଂ ସେହି ଆୟତକ୍ଷେତ୍ରର ଦୈଘ୍ୟରେଏକ ଏକକ ବଢାଇ ଏବଂ ପ୍ରସ୍ଥରୁ ଏକ ଏକକ କମିଗଲେ ୨ୟ ଆୟତକ୍ଷେତ୍ରର କ୍ଷେତ୍ରଫଳ ନିଆଗଲେ ଜଣାପଡିବ କେଉଁ ଆୟତ କ୍ଷେତ୍ରର କ୍ଷେତ୍ରଫଳ ବଢିବ କି କମିବ ।

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  41. Here in this situation as a teacher I will adopt the CRA method. To give concrete idea about area of a rectangle I will use the square blocks of GKA (Ganita Kalika Andolan)kit.By using blocks students can make rectangles and by counting the blocks they can find out the area. Again by increasing and decreasing in their length and breadth they can compare the area . In representation stage students can use the square lined note books to draw rectangle and by counting the squares they can find out the area. Finally in abstract stage using the formula of area of a rectangle they will get clear.

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  42. Here in this situation as a teacher I will adopt the CRA method. To give concrete idea about area of a rectangle I will use the square blocks of GKA (Ganita Kalika Andolan)kit.By using blocks students can make rectangles and by counting the blocks they can find out the area. Again by increasing and decreasing in their length and breadth they can compare the area . In representation stage students can use the square lined note books to draw rectangle and by counting the squares they can find out the area. Finally in abstract stage using the formula of area of a rectangle they will get clear.

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  43. We must clear the idea of area of rectangular space by taking a rectangular paper and increase the length and by decrease the same
    breadth and show that it increase or may decrease.

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  44. First of all the students should follow the correct formula and try to use their logic in solving maths questions. The teacher must teach them the formula how to use them and how to solve these type of question. Then the students can come to their conclusion.

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  45. ଏହି ପରିସ୍ଥିତିକୁ ସମ୍ଭାଳିବାର ସର୍ବୋତ୍ତମ ଉପାୟ ହେଉଛି ଏହାକୁ ଆୟତ୍ତକାର କ୍ଷେତ୍ର କିପରି ଖୋଜିବେ ତାହାର ସୂତ୍ରକୁ ମନେ ପକାଇ ଏହାକୁ ପ୍ରମାଣ କରିବା ଯାହା ହେଉଛି ...... ଆୟତକ୍ଷେତ୍ରର ସୂତ୍ର ହେଉଛି:
    କ୍ଷେତ୍ରଫଳ = ଦ୍ରର୍ଘ୍ୟ x ପ୍ରସ୍ଥ |
    ତା’ପରେ ଏହା ପରେ ସେମାନଙ୍କୁ ସମାଧାନ କରିବାକୁ ଦିଅ ଏବଂ ୮ ମିଟର ଦ୍ରର୍ଘ୍ୟ ଏବଂ ୫ ମିଟର ପ୍ରସ୍ଥ ସହିତ ଆୟତକ୍ଷେତ୍ରର ପୁରୁଣା କ୍ଷେତ୍ରକୁ ଦିଅ ... ଯେତେବେଳେ ପିଲାମାନେ ଦିଆଯାଇଥିବା ସମସ୍ୟାର ସମାଧାନ କଲେ ଏବଂ ସମସ୍ତେ ୪୦m² ର ଉତ୍ତର ସହିତ ବାହାରି ଆସିଲେ .... ତା’ପରେ ଏଥର ସେମାନଙ୍କୁ ପୁନର୍ବାର ପୁନର୍ବାର କୁହନ୍ତୁ ନୂତନ କ୍ଷେତ୍ରକୁ ଦେଖନ୍ତୁ କିନ୍ତୁ ଏଠାରେ ଦ୍ରର୍ଘ୍ୟ ପୁରୁଣା ଦ୍ରର୍ଘ୍ୟରୁ ୧ ମିଟରକୁ ବୃଦ୍ଧି କରାଯିବା ଉଚିତ ଯାହାକି ୮ ମିଟର ଏବଂ ପ୍ରସ୍ଥ ପୁରୁଣା ପ୍ରସ୍ଥରୁ ୧ ମିଟର ହ୍ରାସ ହେବା ଉଚିତ ଯାହା ୫ ମିଟର ଅଟେ | ଦ୍ରର୍ଘ୍ୟ ୯ ମିଟର ଏବଂ ନୂତନ ପ୍ରସ୍ଥ ହେଉଛି ୪ ମି ..... ଆୟତକ୍ଷେତ୍ରର କ୍ଷେତ୍ର କିପରି ପାଇବେ ତାହାର ସୂତ୍ର ପ୍ରୟୋଗ କରି ... ସେମାନଙ୍କୁ ନିରପେକ୍ଷ ଭାବରେ ସମାଧାନ କରିବାକୁ କୁହନ୍ତୁ ..... ଏହି କାର୍ଯ୍ୟକଳାପର ଫଳାଫଳ ସନ୍ତୁଷ୍ଟ ହେବ | ଗୋଟିଏ ଯେପରି ସମସ୍ତ ପିଲା ସମାନ ଉତ୍ତର ସହିତ ବାହାରକୁ ଆସିବେ ଯାହାକି ୩୬ m² ... ତେଣୁ ସେମାନଙ୍କୁ ପୁରୁଣା କ୍ଷେତ୍ର ର ଫଳାଫଳକୁ ନୂଆ ଏରିଆ ସହିତ ତୁଳନା କରିବାକୁ କୁହନ୍ତୁ ....... ଉଭୟ କ୍ଷେତ୍ର ତୁଳନା କରିବା ପରେ ଏଠାରେ ପ୍ରତ୍ୟେକ ଛାତ୍ର ଜାଣିବେ ଏଠାରେ ନୂତନ କ୍ଷେତ୍ର ହ୍ରାସ ପାଇଛି ଏବଂ C ସଠିକ୍ ଅଟେ |

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  46. Debabrata Panda
    By increasing the length and decreasing the breadth ,the area of the rectangle will be reduced. On the other hand if we decrease the length and increase the breadth, the area of the rectangle will be increased. It can can be explained by taking proper examples.

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  47. Hear three students views regarding the area of triangle must be experiment through Ganitika sutra ie Length(breadth) with a graph paper. Students should observe that. They can compare their area and understand that the views of A and B is wrong and the views of C is correct by multiplying length with breadth and getting the area whether increasing length or decreasing breadth. The area will be decreased according to A is correct. Paper cutting having concerned length and breadth may displayed the difference of area of rectangles.

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  48. ଯଦି ଆୟତକ୍ଷେତ୍ରର ଲମ୍ବ ଏବଂ ପ୍ରସ୍ଥ ଯଥାକ୍ରମେ 1 କୁ ବୃଦ୍ଧି ହୁଏ ଏବଂ ହ୍ରାସ ହୁଏ, ସ୍ୱୟଂଚାଳିତ ଭାବରେ କ୍ଷେତ୍ର ପରିବର୍ତ୍ତନ ହେବ ।
    ଯଦି ଏକ ଆୟତକ୍ଷେତ୍ରର ଦ୍ରଘ୍ୟ 6 ମିଟର ଏବଂ ପ୍ରସ୍ଥ 4 ମି. ତେବେ ଏକ ଉଦାହରଣ ନେବା, ତେଣୁ କ୍ଷେତ୍ରଟି ଲମ୍ବ x ପ୍ରସ୍ଥ = 6m x 4m = 24m = - ---- (କ),
    ବର୍ତ୍ତମାନ ଯଦି ସମାନ ଆୟତକ୍ଷେତ୍ରର ଲମ୍ବ 1m ବଢାଇବା, ଅର୍ଥାତ୍ 6 + 1 = 7 ମିଟର ଏବଂ ପ୍ରସ୍ଥ 1m କମାଇବା, ଅର୍ଥାତ୍ 4-1 = 3m ହ୍ରାସ ହୁଏ, ତେବେ ନୂତନ କ୍ଷେତ୍ର 7x3 = 21m² ( ଖ) |

    ତେଣୁ C ସଠିକ୍ ଅଟେ |

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  49. Student can slove this question by doing it pratically so that they can understand and slove this question easily.

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  50. Mr Bhoi is absolutely correct

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  51. Teacher should draw the rectangle with assumed length and breadth and find out the area by counting the small squares inside the triangle.
    Then by changing in their length and breadth snd find out the area on another graph paper by counting the squares.
    By comparing the learner will know the area decreases.

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  52. Teacher should explain perfectly the area concept about a rectangle and its formula through a visual aids

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  53. Teacher should explain the situation with examples and clear the doubts.

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  54. Can be explained by learning by doing method.

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  55. When length of a rectangle increased by 1 and breadth decreased by 1then the area will decrease in comparison to area of previous rectangle. We can make it understand to students by using ICT .We can give them various examples by dragging the figures in different measurements.

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  56. Yes,it is absolutely correct sir.

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  57. Teacher should explain the situation to students and explain the formula.Then they will do the sum perfectly.

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  58. A teacher should draw a rectangle. She/he should discuss 4-6 examples regarding that rectangle. 1st, she/he should take a fix length, breadth and find out the area. Then she/he should take 4-5 examples of decreasing one of them by 1 and increasing one of them by 1. Hence, the answer can be found.
    Or, they can also proof it theoretically.

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  59. First I will give some visual example regarding area of rectangle,then formula regarding area of rectangle.then example of increasing of length and decreasing of breadth in figure two or three.it will help them to understand better.

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  60. ଏହି ପରିସ୍ଥିତିର ପରିଚାଳନା ପାଇଁ ନିମ୍ନଲିଖିତ ପରି ସାରଣୀ ପ୍ରସ୍ତୁତ କରିପାରିବା, ଯାହାର ଶିରୋନାମା ଥିବ -

    ଆୟତକ୍ଷେତ୍ରର ଦୈର୍ଘ୍ୟ, ପ୍ରସ୍ଥ, କ୍ଷେତ୍ରଫଳ, ଦୈର୍ଘ୍ୟ+1ଏକକ, ପ୍ରସ୍ଥ-1ଏକକ, କ୍ଷେତ୍ରଫଳ, କ୍ଷେତ୍ରଫଳରେ ବୃଦ୍ଧି/ହ୍ରାସ
    ଅନ୍ଯୁନ 3ଟି ଉଦାହରଣ ନେବା ।

    ସାରଣୀରୁ ସୁସ୍ପଷ୍ଟ ହୋଇଯିବ ଯେ ପ୍ରଶ୍ନଟିର ଉତ୍ତର C ସହ ମେଳ ଖାଉଛି । ଏହାଦ୍ବାରା A ଓ B ଙ୍କର ଭୁଲ ଧାରଣାଟି ମାର୍ଜିତ ହୋଇପାରିବ ଏବଂ ସେମାନଙ୍କର ଶିକ୍ଷଣଟି ଉତ୍ତମ ଅଗ୍ରଗତି କରିପାରିବ ।

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