Question

find the circumference of a circle that has a radius of 212 mm

Answer 1

Answer:

1332.04

Step-by-step explanation:

C=2πr=2·π·212≈1332.03529

Answer 2

Answer:

1332.035 millimeters

Step-by-step explanation:

If you know the diameter or radius of a circle, you can work out the circumference. To begin with, remember that pi is an irrational number written with the symbol π.  π is roughly equal to 3.14.  You can also work out the circumference of a circle if you know its radius. Remember that the diameter is double the length of the radius. We already know that C = πd. If r is the radius of the circle, then d = 2r. So, C = 2πr.