Question

there are 20 cylindrical pillar in a path. The radius if it is 14 cm and height is 1m.find the total cost of painting its curved surface area at rate of 10 rupees per sq m​

Answer 1

Answer:

.cs A=2πrh

20 cylindrical pillars=40πrh

= 40x22x14x100/7=176000. Cm2

cost of painting = 17.6x10=Rs.176

Answer 2

Solution: convert 14cm to m_0.14m

CSA of cylinder=2πrh

2×22\7×0.14×1

44/50

CSAof 20 pillars =44/50×20=88/5

cost of painting 20 pillars =88/5×10=176

:.cost of painting 20 pillars =£176