Question

The cost of painting curved surface area of a cylindrical pillar of height 10 m and radius 3.5 m at ₹10 per $m^2$ is ₹ 2200.
(Take $\pi =\frac{22}{7}$)

• A. True
• B. False

Answer 1

The correct option is A

True

Given,

Height of the cylindrical pillar, $h=10m$

Radius of the cylindrical pillar, $r=3.5m$

$\therefore$Curved Surface area of the pillar $=2\pi rh$
$=2\times \frac{22}{7}\times 3.5\times 10$
$=220m^2$
$\therefore$Total cost = C.S.A. of the pillar $\times$ Cost per m${}^2$ = 220 $\times$ 10 = ₹ 2200
Hence the given statement is true.