puestion no 24 second part
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Radius of pillar = 28 cm
Height of pillar = 4 m = 400 cm
CSA of one pillar = 2* pi * r *h
= 2* 22 *28 * 400 / 7
= 44 * 4* 400
= 44 * 1600
= 70400 cm^2
CSA of 24 pillars = 70400 * 24
= 1689600 cm^2
= 168.96 m^2
Cost of painting = 168.96 * 8
= Rs 1351.68
Height of pillar = 4 m = 400 cm
CSA of one pillar = 2* pi * r *h
= 2* 22 *28 * 400 / 7
= 44 * 4* 400
= 44 * 1600
= 70400 cm^2
CSA of 24 pillars = 70400 * 24
= 1689600 cm^2
= 168.96 m^2
Cost of painting = 168.96 * 8
= Rs 1351.68
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