Question

The diameter of a circle is 20 centimeters. What is the circumference?Given the exact answer in simplest form._____ centimeters (pi, fraction)

Answer 1

The circumference of the circle using its diameter is

$C=\pi\times d$

Since the diameter of the circle is 20 cm, then

d = 20

Substitute it in the rule

$\begin{gathered} C=\text{ }\pi\times20 \\ C=20\pi\text{ cm} \end{gathered}$

The exact answer is 20 pi cm