Question

1. find the circumference. 20cm circumference = ____

Explanation:

Step1: Recall the formula for circumference

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

Step2: Substitute the given diameter

Given $d = 20$ cm, so $C=\pi\times20 = 20\pi$ cm. If we take $\pi\approx3.14$, then $C\approx20\times3.14=62.8$ cm.

Answer:

$20\pi$ cm (or approximately $62.8$ cm if $\pi\approx3.14$)