Question

if the diameter of a circle is 5 kilometers, what is the circumference?

Explanation:

Step1: Recall the formula for the circumference of a circle

The formula for the circumference \( C \) of a circle is \( C=\pi d \), where \( d \) is the diameter of the circle.

Step2: Substitute the given diameter into the formula

We are given that the diameter \( d = 5 \) kilometers. Substituting this value into the formula \( C=\pi d \), we get \( C=\pi\times5 = 5\pi \) kilometers. If we use the approximation \( \pi\approx3.14 \), then \( C\approx5\times3.14 = 15.7 \) kilometers.

Answer:

The circumference of the circle is \( 5\pi \) kilometers (or approximately \( 15.7 \) kilometers).