Question

there is 20 cylindrical pillars in the temple. each pillar has radius of 28cm and height 7cm. find the cost of painting on these pillars at the rate of rs25 per 100cm sq
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Answer 1

Answer:

As we know that,

CSA of cylinder =2πrh

Radius of a pillar =28cm=0.28m

Height of pillar =7m

CSA of 1 pillar =2×7/22×0.28×7

=44×0.28=12.32m2

CSA of 20 pillars =12.32×20

=246.4m2

Cost of painting per meter square =Rs.25

Therefore,

Cost of painting 246.4m2

=246.4×25=Rs.6160