Question

What is the circumference of a circle with a radius of 2.5 m?

Answer 1

The circumference of a circle is always calculated by 2$\pi$R
So if R=2.5 m this circumference is 2*$\pi$*2.5 m
Which is 5$\pi$ m (choice B)

Hope this helped!

Answer 2

C = (2)(pi)(r)
C = 2*(pi)*2.5
Because you can multiply in any order, you can do 2 * 2.5
C = 5*(pi)
The answer is B