# In a Building, There Are 24 Cylindrical Pillars. for Each Pillar, the Radius is 28 M, and the Height is 4 M. Find the Total Cost of Painting the Curved Surface Area - Mathematics

Sum

In a building, there are 24 cylindrical pillars. For each pillar, the radius is 28 m, and the height is 4 m. Find the total cost of painting the curved surface area of the pillars at the rate of ₹ 8 per m2.

#### Solution

Radius of cylindrical pillar, r = 28 cm = 0.28 m, height = h = 4 m
curved surface area of a cylinder = 2πrh
curved surface area of a pillar = 2 xx 22/7 xx 0.28 xx 4 = 7.04 m2
curved surface area of 24 such pillar = 7.04 × 24 = 168.96 m2
cost of painting an area of 1 m2 = Rs. 8
Therefore, cost of painting 1689.6 m= 168.96 × 8 = Rs. 1351.68.
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Chapter 21: Surface Area, Volume and Capacity - Exercise 21 (E) [Page 244]

#### APPEARS IN

Selina Concise Mathematics Class 8 ICSE
Chapter 21 Surface Area, Volume and Capacity
Exercise 21 (E) | Q 10 | Page 244
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