Question

if the radius of a circle is 28m what is the circumference

Answer 1

The circumference of a circle is 2 times pi times the radius or diameter times pi.
So, in this case, you can multiply 28 with 2 and then multiply it by pi.
(28)(2)(pi)=(56)(pi)=175.84

Answer 2

The formula for Circumference is 2(pi)r
2 x pi(3.14) x r(28)
 the circumference is 175.84