Question

How to find the side of rhombus if diagonals are given?

Answer 1

We know that diagonals of a rhombus bisect each other at 90 degrees
so if you have been given there measure take one of a triangle which is 1/4 of rhombus
Apply Pythagoras theorem in the triangle and then get side(hypotenuse)
Also all sides of rhombus are equal so if you have one side measure you have all sides measure.
Hope it helps
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Answer 2

if diagonals are given then it can be divided into half and anyone triangle can be taken as right angle triangle by Pythagoras Theorem we can find the side of rhombus.
and since all the sides of rhombus are equal every side can be taken out