Question

the figure below is a drawing of a circular window in a building. circular window 40 inches how long is the radius in inches? 20 80 10 40

Explanation:

Step1: Recall radius-diameter relation

The radius $r$ is $\frac{1}{2}$ the diameter $d$.

Step2: Substitute given diameter value

Given $d=40$ inches, calculate $r=\frac{40}{2}=20$ inches.

Answer:

A. 20