Question

What is the exact circumference of a circle with a radius of 45 cm? HELP ASAP!!!

Answer 1

Lets get started :)

The circumference formula of a circle is 
C = 2$\pi$r (r being the radius)

If radius = 45, substitute 45 instead of r

C = 2 $\pi$(45)
    =90$\pi$
    ≈ 282.7433388 

I suppose you leave it in the pi ($\pi$) form

Answer 2

The answer is 282.7433