Perimeter of a square is 40 cm then the length of diagonal is
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Given
perimeter of a square = 40 cm
4xside. = 40
side = 40/4 =10 cm
As per pythagorean in Triangle DAB
DB^2 = DA^2 + AB^2
DB^2 = (10)^2 + (10)^2
diagonal ^2 = 100 +100
= 200
diagonal. = √ 200 =10√2 cms
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