The diagonal of a square is 122 cm. Find its perimeter.
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Answer:
diagonal=122 cm
side=a
thus
122²= 2a²
14884=2a²
a²=7442
a=86.26
approximately
a=86.2
thus
perimeter= 4×86.2=344.8cm
thus
perimeter of square is 344.8 cm
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