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Diagonals of a rhombus are 20 cm and 21 cm respectively, then find the side of rhombus and its perimeter.

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Let ABCD be the rhombus.
AC = 20 cm and BD = 21 cm
We know that the diagonals of a rhombus bisect at right angles.
So, AO = OC = 10 cm
And BO = OD = 10.5 cm

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