A circle has a circumference of 28 (pie) m. Find the radius of the circle. (C= 2 (pie) = (pie)d)

C does not equal 2 X Pi. It equals Pi X the Diameter. If you know two of the elements of the equation, then you can solve for the third.
If C = 28 x Pi then C = 87.96 (whether meters or any other unit). So, C (87.96) = Pi (3.1416) x D. D then equals 87.96 divided by 3.1416 which equals 28. The radius would then be 14.

The circumference is equal to pi times the diameter.. so looks like you have a diameter of 28.. means the radius is half the diameter or 14.

It's Pi, Pi dammit. And this is Geography, not Geometry.

It's pi, not pie.