Question

What is the circumference of the circle in terms of pi? The radius is 2.2

choices are 1.1, 1.21, 2.2 and 4.4
im so confused so could someone please explain what i did wrong?

Answer 1

I hope this helps you



circumference=pi.r^2



circumference=pi. (2,2)^2


circumference=4,84.pi

Answer 2

We will use formula for circumference of circle:
lets name it as O

O = 2*r * pi

when we express r in this formula we get:

O = 2*2.2*pi
O = 4.4*pi

From this we can see that for given radius, answer is 4.4. The formula only depends on pi and that is what "in terms of pi" means.