10. Along a highway 50conical pillars are constructed. Each pillar has

1.	10. Along a highway 50conical pillars are constructed. Each pillar has base diaineter 28 cm and vertical heighti8cm. find the total cost of painting these pillars at the rate of Rs. 120 per m.(Take T 22)
Answer» given radius = 14cm and height = 18cm curved surface area of cylinder = 2 π r h = 2* 22/7* 14* 18 = 1584 sq. cm = 1584/10000 sq. m now C.S.A. of 50 such pillars = 1584/10000 * 50 = 7.92 sq. m cost of painting 1 pillar = Rs.120 cost of painting 100 such pillars = 7.92 * 120 = Rs. 950.40--------------Ans.

10. Along a highway 50conical pillars are constructed. Each pillar has base diaineter 28 cm and vertical heighti8cm. find the total cost of painting these pillars at the rate of Rs. 120 per m.(Take T 22)

Answer»

given radius = 14cm and height = 18cm

curved surface area of cylinder = 2 π r h

= 2* 22/7* 14* 18 = 1584 sq. cm

= 1584/10000 sq. m

now C.S.A. of 50 such pillars = 1584/10000 * 50 = 7.92 sq. m

cost of painting 1 pillar = Rs.120

cost of painting 100 such pillars = 7.92 * 120

= Rs. 950.40--------------Ans.