How do you find circumference using radius

C=π×2r

Circumference is equal to pi times double the radius

   Determine the radius of a circle. Let's assume it's equal to 14 cm.

   Substitute this value to the formula for circumference: C = 2 * π * R = 2 * π * 14 = 87.9646 cm.

   You can also use it to find the area of a circle: A = π * R² = π * 14² = 615.752 cm².

   Finally, you can find the diameter - it is simply double the radius: D = 2 * R = 2 * 14 = 28 cm.

   Use our circumference calculator to find the radius when you only have the circumference or area of a circle.

If you wish to calculate the properties of a three-dimensional solid, such as a sphere, cylinder or cone, it's best to use our volume calculator.

         Hope this helped a little :)

i believe the answer is letter c) 8

step-by-step explanation: