Question

In the given figure, which of the following option gives the curved surface area of the cylinder?

• A. 2$\pi$ (R+r)h
• B. 2$\pi$ (R - r)h
• C. $\pi$ (R + r)h
• D. $\pi$ (R - r) h

Answer 1

The correct option is A

2$\pi$ (R+r)h

We know that,
Curved surface area of cylinder
= 2$\pi$ rh

Curved surface area of the given cylinder
= Outer curved surface area + Inner curved surface area
= 2 $\pi$ (R)h + 2 $\pi$ (r)h
= 2 $\pi$ (R + r)h