10 cylinder val pillars of a building have to be paidnpaidn t ed if the diameter of a circular cylinder each pillar is 50cm and the height 4m what will be the cost of painting at the rate of 50 Paise pet sq. n
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t.s.a of 10 cylindrical pillers =
2(h+r). *10
2* 22/7*0.25 m (4m+0.25m). *10
11/7 *4.25. *10
46.75/7.*10
6.67. *10
66.7. m2
answer is 66.7 *50 =3350 paise=
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