Finding Radius of circle with Circumference

what would be the answer to the following and how'd you get it?

What is the radius of a circle when it's circumference is about 254 cm?
What is the radius of a circle when it's circumference is about 321 cm?

How would you get the answer?

Divide the circumference by pi (3.14). Then divide that number by 2.That is how you get the radius. The radius of a circle when its circumference is about 254 cm is about 40 cm. The radius of a circle when its circumference is about 321 cm is about 51cm. Hope this helps. Have a good day! :)

Find the equation for circumference of a circle given the diameter or the radius. Then do the math.

2 pi r = 254 cm
radius = 254/2x3.14 = 40.44 cm

2pi r = 321 cm
radius = 321/2 x 3.14 = 51.11 cm