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The diameter of a semicircle is $2\,\text{kilometers}$ . What is the semicircle's radius? $\newline$ $\_\_\_\_\_$ kilometers

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Circles: word problems

Full solution

Q. The diameter of a semicircle is

2\,\text{kilometers}

. What is the semicircle's radius?

\newline

\_\_\_\_\_

kilometers

Understand the problem: Step $1$ : Understand the problem. We need to find the radius of a semicircle whose diameter is $2$ kilometers.
Recall relationship: Step $2$ : Recall the relationship between the diameter and radius of a circle (or semicircle). The radius is half of the diameter, i.e., $r = \frac{d}{2}$ .
Calculate the radius: Step $3$ : Calculate the radius. Since the diameter is $2$ kilometers, the radius is $2 / 2 = 1$ kilometer.

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A(d)=\pi d^{2}

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