How To Find the radius?

Answer 1

• If you know the diameter, you can divide it in half.

  • diameter = 40, 40/2 = radius =20

• If you know the circumference, divide the circumference by the value of Pi times 2 (6.28).

  • circumference = 20, 20/6.28 = radius = 3.184

• If you know the area, divide the area by Pi & find the square root of your answer.

  • area = 50, 50/3.14(Pi) = 15.92, square root of 15.92 = 3.99 = radius