Question

The cost of painting the curved surface area of a cylindrical pillar of height 10 m and radius 3.5 m at ₹ 10 per sq. meter is:
(Take pi=$\frac{22}{7}$)

• A. True
• B. False
• C. ₹ 4400
• D. ₹ 550

Answer 1

The correct option is A

True

Given, radius of the pillar = 3.5 m
Height of the pillar = 10 m

We know that, the curved surface area of the pillar = 2πrh

$=2\times \frac{22}{7}\times 3.5\times 10$

$=220m^2$

$\therefore$ Total cost = CSA of pillar $\times$ Cost per m${}^2$ = 220 $\times$ 10 = ₹ 2200