Question

A gas cylinder has a diameter of $14$m and height is $0.2$m. Find its surface area. ($\pi =22/7$)

• A. $316.512{mm}^2$
• B. $316.512m$
• C. $316.512m^3$
• D. $316.512m^2$

Answer 1

The correct option is D $316.512m^2$

Surface area of cylinder is $A=2\pi r(r+h)$

Here the gas cylinder has diameter $14$ m and therefore, the radius is half of diameter that is $r=7$ m and height $h=0.2$ m.

Thus,

$A=2\pi r(r+h)=2\times \frac{22}{7}\times 7(7+0.2)=316.512$

Hence, the surface area of the gas cylinder is $316.512m^2$.