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6. Mensuration
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Q43 of 61 Page 93

Length of a rectangular field is 6 times its breadth. If the length of the field is 120cm, find the breadth and perimeter of the field.

Given:


Length of rectangle = 120 cm


Breadth of rectangle = b


Length = 6b


Breadth = 120 / 6


= 20 cm


Perimeter = 2 × (l + b)


= 2 × (20 + 120)


= 280 cm.


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41

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(a) What is the perimeter of the rectangle ABCD?


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(Two parts of equal area are shown here)


(d) Find the perimeter of each part which you have divided. Are they all equal?

42

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Questions · 61
6. Mensuration
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