OR
For a rhombus ABCD, prove that 4AB2 = AC2
+ BD2.
Answer:
In 
and 
(Each
= 90o)
(Common)
(By
A.A. Rule)
OR
The diagonals of rhombus intersect at O.
and 
...(1)
(
diagonals
of a rhombus bisect each other at right angles)
In right 
(By
Pythagoras Theorem)
(From
(1)]
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