Question

a cylindrical pillar is 50 cm in diameter and 3.5 m in height find the cost of painting the curved surface area of the pillar at the rate of rupees 12.50 per metre square

Answer 1

Pillar is 50 cm in diameter and 3.5 m high(h)
Convert the diameter (d) to meters (m)

50 cm x 1 m = 0.5 m is the diameter in meters
100 cm
PI = π = 3.14
circumference (C) = πd = 3.14 x 0.5 m = 1.57 m

The cylinder surface area is C x h = 1.57 m x 3.5 m = 5.5 m2

Cost of white washing = 5.5 m2 x Rs 1.25 = Rs 6.88
m2

Answer 2

ANSWER IS GIVEN IN THE ATTACHMENT