Question

1. what is the radius if the diameter of a cylinder is 10 cm?

a. 10 cm
b. 5 cm
c. 2.5 cm
d. 20 cm

Explanation:

Step1: Recall radius - diameter relation

The formula is $r=\frac{d}{2}$, where $r$ is radius and $d$ is diameter.

Step2: Substitute given diameter

Given $d = 10$ cm, so $r=\frac{10}{2}=5$ cm.

Answer:

B. 5 cm