Twenty Cylindrical Pillars of the Parliament House Are to Be Cleaned. If the Diameter Of Each Pillar is 0.50 M and Height is 4 M. What Will Be the Cost of Cleaning Them at the Ra - Mathematics

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Answer in Brief

Twenty cylindrical pillars of the Parliament House are to be cleaned. If the diameter of each pillar is 0.50 m and height is 4 m. What will be the cost of cleaning them at the rate of Rs. 2.50 per square metre? 

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Diameter of each pillar=`0.5m` 

Radius of each pillar` (r) a/2= 0.5/2=0.25m `

Height of each pillar=4m 

Curved surface area of each pillar=`2pirh` 

= `2xx3.14xx0.25xx4m^2` 

=` 44/7 m^2` 

Curved surface area of 20 pillars= `20xx44/7m^2` 

Given, cost of cleaning= Rs.2.50 per square meter 

∴Cost of cleaning 20 pillars = `Rs.2.50xx20xx44/7` 



Concept: Surface Area of Cylinder
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RD Sharma Mathematics for Class 9
Chapter 19 Surface Areas and Volume of a Circular Cylinder
Exercise 19.1 | Q 11 | Page 8

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