Question

1. the diameter of a circle is 20 m. find circumference in terms of π. d = 20m c = 2πr r = 19 c = 2π×19 = 38π pl 8. the radius of a circle is 19 ft. find its terms of π.

Explanation:

Step1: Find the radius from the diameter

Given diameter $d = 20$ m, and the formula $r=\frac{d}{2}$, so $r=\frac{20}{2}=10$ m.

Step2: Calculate the circumference

The formula for the circumference of a circle is $C = 2\pi r$. Substitute $r = 10$ m into the formula, we get $C=2\pi\times10 = 20\pi$ m.

Answer:

$20\pi$ m