Question

In a temple there are 20 cylinderical pillars. The radius of each pillar is 14 cm and height 5 m. Find the total cost of paining the curved surface area of pillars at the rate of Rs. 10 per $m^2.$

Answer 1

CSA$=2\pi r$h

$=2\times \frac{22}{7}\times \frac{14}{100}\times 5=4.4m^2$

CSA of $20$ pillars

Cylinders $=20\times 4.4$$=88m^2$

Total cost $=10\times 88$$=880$Rs.