Question

A cylindrical pillar is 50cm in diameter and 3.5m in height .find the cost of painting the curved surface of the pillar at the rate of the of Rs 12.50perm2

Answer 1

r = 25 cm = 0.25 m
h= 3.5 m
C.S.A = 2π r h
= 2 ×22/ 7 ×0.25 × 3.5 = 5.5 m²
cost of painting the curved surface of the pillar = 5.5× 12.50 = Rs 68.75

Answer 2

Radius=0.25m
Height=3.5m
Radius=1m
CSA=2pie rh
=2×22/7×0.25×3.5
=5.5m^2

Cost of painting one m^2=12.50
Cost of painting 5.5m^2=12.50×5.5
=68.75ruppees.


Hope it helped you..................