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  4. In a square if length of the diagonal is 30cm then side of the square is .

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Q. In a square if length of the diagonal is 30cm then side of the square is ________.

Geometry

Solution:

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$(A C)^2 =A B^2+B C^2 $
$(30)^2 =x^2+x^2$
$2 x^2 =900 $
$x^2 =450 $
$x =3 \times 5 \sqrt{2} $
$ =15 \sqrt{2}$