Question

Find the cost of polishing a circular table-top of diameter 1.6 m, if the rate of polishing is Rs 15/m 2 . (Take π = 3.14)

Answer 1

To calculate the cost of polishing of circular table, we have to calculate its area first of all.Here, Given diameter of the circular table-top = 1.6 m. Hence, r = 0.8 m

Area = π r2
= 3.14 × 0.8 × 0.8 = 2.0096 sq m

Cost of polishing = Rate × Area
= Rs 15 × 2.0096 = Rs 30.144

Answer 2

π=3.14

d=1.6m

r=0.8m

area of table top=πr²

=3.14x0.8x0.8=2.0096(approx.)

cost of polishing=15x2.0096=₹30.144

Hope this helps