Question
Each side of a rhombus is 20cm long and the length of
one of its diagonals is 24cm, then find the area of the rhombus.(in cm 2 )Solution
We know that the diagonals of a rhombus bisect each other at right angles. now Triangle OAB- ∠AOB=90 
AB=20cm, AC=24cm, OA=12cm We know that the diagonals of a rhombus bisect each other at right angles. now Triangle OAB- ∠AOB=90 AB=20cm, AC=24cm, OA=12cm 
Area of rhombus =1/2 ×AC×BD =1/2 ×24×32 =12×32 = 384cm2
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