Question

find the area of a square whose diagonal is 5√ 2 cm.
[ Hint Area =[1/2×diagonal]² square units.

Answer 1

Area = 1/2 x (5√2)² 
         =1/2 x 5√2 x 5√2 
         =25 cm²

Answer 2

Area of square=[ 1/2*diagonal]²
=[1/2*5√2]²
=[5/√2]²
=25/2
=12.5 sq. units