Question

Find the cost of polishing a circular table-top of diameter 1.5 m, if
the rate of polishing is $ 15/m². (Take n = 3.14)​

Answer 1

diameter = 1.5 m

radius = 1.5/2 m = 0.75 m

area of the circular table top =

$\pi {r}^{2} = 3.14 \times {0.75}^{2} = 1.76625 {m}^{2}$

cost of polishing = area * rate of polishing

$= 1.76625 \times 15$

= $ 26.49375