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Q.

A square and Q rectangle have the same perimeter. The area of rectangle if the side of the square is 60cm and the length of the rectangle 80cm is

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a

$1600 c m^{2}$

b

$3200 c m^{2}$

c

$2400 c m^{2}$

d

$1800 c m^{2}$

answer is B.

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$4 S = 2 (l + b)$

$4 \times 60 = 2 (80 + b)$

$120 - 80 = b = b = 40 c m$

$= ℓ \times b c m^{2}$

$= 80 \times 40 c m^{2}$

$= 3200 c m^{2}$

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