Question

which is the best estimate of the circumference of this circle? a. 18 units b. 3 units c. 42 units d. 6 units

Explanation:

Step1: Recall circumference formula

The formula for the circumference of a circle is $C = 2\pi r$, where $r$ is the radius.

Step2: Substitute radius value

Given $r=3$, substitute into the formula:
$C = 2\times\pi\times3 = 6\pi$

Step3: Estimate the value

Use $\pi\approx3$, so $6\pi\approx6\times3=18$

Answer:

A. 18 units