Radius, Diameter, Circumference Review

Front

What is the formula to calculate the diameter of a circle if the radius is known?

Back

Diameter = 2 * Radius

Front

If a circle has a radius of 12 inches, what is its diameter?

Back

24 inches

Front

What is the formula for calculating the circumference of a circle?

Back

Circumference = 2 * π * Radius or Circumference = π * Diameter

Front

If the radius of a circle is 10 feet, what is its circumference?

Back

62.83 feet (using Circumference = 2 * π * 10)