Question

A cylinder is formed by rolling a rectangular sheet along its length as shown below. What is the radius of the cylinder?

• A. $\frac{5}{\pi }$ cm
• B. $\frac{10}{\pi }$ cm
• C. 5 cm
• D. 2.5 cm

Answer 1

The correct option is A

$\frac{5}{\pi }$ cm

Length of the rectangle will be the circumference of circular base of the cylinder. Thus, using that we can find the radius of cylinder.

2πr = 10 cm

$\Rightarrow$ r =$\frac{5}{\pi }$ cm