Question

A triangular board of perimeter 32m has two sides of equal length and third side is of length 12m.find the cost of painting it at the rate of Rs150 meter square. [given root 2= 1.41 and root 3= 1.73]

Answer 1

a=32m
b=32m
c=12m
s=32+32+12÷2
=39m
area of board=√39(39-32)(39-32)(39-12)
=√39×7×7×27
=√3×13×7×7×3×3×3
63√13m2
63×3.61=227.43m2
cost of painting board=227.43×150=Rs34114.5