Question

A circular plot of land , 42m in diameter, has a path 3.5m wide running round it, on its outside. Find the cost of making the path at ₹ 4 per square metre.

Answer 1

Answer:

diameter 42 m

radius=42/2 m=21 m

area of the path =

π{(21+3.5)^2-21^2} sq m

=π{(21+3.5+21)(21+3.5-21)}sq m

=π×45.5×3.5sq m

=22×45.5×3.5/7 sq m

=22×45.5×0.5 sq m

=11×45.5 sq m

=500.5 sq m

cost of making the path ₹4×500.5=₹2002