Question

the diameter of a circle is 4 inches. what is the circumference?
give the exact answer in simplest form.
inches

Explanation:

Step1: Recall circumference formula

The circumference $C$ of a circle with diameter $d$ is $C = \pi d$.

Step2: Substitute diameter value

Substitute $d = 4$ inches into the formula:
$C = \pi \times 4 = 4\pi$

Answer:

$4\pi$ inches