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Question

Each diagonal of a square is 12cm long. Its area is
(a) 144cm2
(b) 72cm2
(c) 36cm2
(d) none of these

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Solution

(b) 72cm2
Let the side of the square be a units

Diagonal of a square =2a=12

a=122=62 cm

Thus, area of the square =a2=62×62=72cm2


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