Answer :
As diagonals of a rhombus are equal and cut each other at right angle.
using Pythagoras theorem:
AD2 = AO2 + OD2
AD2 = 152 + 202
AD2 = 225 + 400
AD2 = 625
AD = √625
AD = 25 cm
So, side of the rhombus is 25 cm.
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