Question

in a building there are 15 cylindrical pillars the radius of each pillar is 21 cm and height is 4 metre find the total cost of painting the curved surface area of all pillars at the rate of rupees 10 per metre square. plese help me​

Answer 1

Answer:

Answer. curved surface area of a pillar= 2×22\6×0.28×4=7.04metresq.