Question

Circle A has a radius of 21 meters . Circle B has a radius of 28 meters. Find the circumference if each circle in terms of pi

Answer 1

Circle A=
`42\pi`

Circle B =
`56\pi`

Explanation:

Circumference of a circle =
`2\pi r`

Since you are given the radius, you put it in place of r

Circle A =
`2 *\pi *28\\21*2 = 42\\\\42\pi`

Circle B=
`\\2*\pi *28\\28*2 =56\\56\pi\\\\\\`