Question

find the cost of polishing a circular table top of diameter 2.8 M if the rate of polishing is Rs 20 per metre square​

Answer 1

we are given

DIAMETER= 2.8 m

we have to find the area of circle

diameter =$area = \pi r^{2}$

and diameter = 2 radius

if d = 2.8 m

than radius = 1.4 m

apply radius's value

$area=\pi [1.4]^{2}$

area =1.96 $\pi$