Question

If the diameter of a cylinder is $28cm$ and it height is $20cm$, then its curved surface area is

• A. $820{cm}^2$
• B. $1760{cm}^2$
• C. $3520{cm}^2$
• D. $2460{cm}^2$

Answer 1

Answer: (B)

$1760{cm}^2$

Given:-

Diameter of cylinder $\left(d\right)=28cm$

Radius of cylinder $\left(r\right)=\frac{d}{2}=14cm$

Height of cylinder $\left(h\right)=20cm$

As we know that, curved surface area of cylinder is given as-

$CSA=2\pi rh=2\times \frac{22}{7}\times 14\times 20=1760{cm}^2$