Question

A cylindrical piller has a diameter of $56cm$ and is of $35m$ high. There are $16$ pillars around the building. Find the cost of painting the curved surface area of all the pillars at the rate of $Rs.5.50$ per $1m^2$

Answer 1

Given a cylindrical pillar diameter of $56cm$ and its height is$35m.$

Then radius of pillar =$\frac{56}{2}cm=\frac{28}{100}m=0.28m$

Then curved surface area of pillar =$2\pi rh=2\times \frac{22}{7}\times 0.28\times 35=61.60m^2$

Then the curved surface area of $16$ pillars =$61.60\times 16=985.60m^2$

Given the cost of painting the curved surface area of all pillar at the rate of $Rs5.50$ per $1sqm$

Then the cost of paining of 16 pillars =$985.60\times 5.50=5420.80$ Rs