Question

the cost of polishing acircular table top of diameter 2.1 m if the rate of polishing is 10 per m2

Answer 1

r= d/2
= 2.1/2
r =1.05
area of circular table top = pai r^2
= 22/7×1.05×1.05
=22×0.15×1.05
=3.4650m^2
cost of 1m ^2= 10rs
cost of 3.465m^2 =(3.465×10)rs
= 34.65rs