a mansion has 12 cylindrical pillars each having radius 50 cm and height 3 5 m find the cost of - Maths - Surface Areas and Volumes

Question

a mansion has 12 cylindrical pillars each having radius 50 cm and
height 3 5 m find the cost of painting the curved surface of the
pillars at rs 20 per square meter

Manbar Singh · Accepted Answer

We have,radius of base of cylindrical pillar, r = 50 cmheight of each pillar, h = 3
5 m = 3
5 × 100 cm = 350 cmNow, CSA of 1 pillar = 2πrh = 2 × 227 × 50 × 350 = 110000 cm2 = 11 m2    as, 1 m2 = 10000 cm2Now, CSA of 12 pillars = 12 × 11 = 132 m2Now, cost of painting 1 m2 of area = Rs 20cost of painting 132 m2 of area = Rs 20 × 132 = Rs 2640

a mansion has 12 cylindrical pillars each having radius 50 cm and height 3.5 m find the cost of painting the curved surface of the pillars at rs 20 per square meter.