Answer :
Since the sides of a rhombus are equal there fore each side = 
= 
= 8 m
Let a, b and c are the sides of triangle and s is
the semi-perimeter, then its area is given by:
A = 
where 
[Heron’s Formula]
= 
= 13
A= 
A = 
= 
cm2
Hence, area of rhombus ABCD = 2 ×31.22 m2
= 62.44 m2
Total painting area of rhombus = 62.44 × 2 = 124.88 m2
Cost of painting of rhombus on both sides = 124.88 × 5 = Rs 624.50
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