The diagonal of a square is 12rote2 cm. Find its perimeter.
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diagonal=12√2
side=a
by Pythagoras theorem
diagonal ²= side²+side²
(12√2)²=a²+a²
288=2a²
a²=288/2
a=12
thus
perimeter of square= 4a=4×12=48cm
thus
perimeter of square is 48cm
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