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6. Mensuration
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Q15 of 61 Page 93

Area of a square is doubled if the side of the square is doubled.

Let us try this using formula.

Area of square = side2


So new condition, side = 2× side


So new area = (2 × side) 2


= 4 × side2


So the new area becomes 4 times the old area.


So statement is false.


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13

(a) 1m = _________ cm.

(b) 1sqcm = _________ cm × 1cm.


(c) 1sqm = 1m × _________ m = 100cm × _________ cm.


(d) 1sqm = _________ sqcm.

14

If length of a rectangle is halved and breadth is doubled then the area of the rectangle obtained remains same.

16

Perimeter of a regular octagon of side 6cm is 36cm.

17

A farmer who wants to fence his field, must find the perimeter of the field.

Questions · 61
6. Mensuration
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