Answers

2014-03-11T11:59:38+05:30
A pipe is a cylinder.
CSA of a cylinder is πr²H.
Given radius of the pipe is 0.7 metres
Given length of cylinder is 21 metres
CSA=π(0.7)(0.7)(21)

:. CSA is 22/7 *0.49 *21=66*0.49
=32.34 sq metres

cost of painting 1 sq metre is 10 rupees
cost of painting 32.34 square metres is 323.4 rupees

0
2014-03-11T12:05:42+05:30
 C.S.A =2πrh

=2*22/7*.35*21
=4.62 m²

1m² = Rs 10

total cost = 4.62* 10
= Rs 46.2

0