- Radius, R
- Diameter, D
- Circumference, C
- Area, A

- Diameter = 2 * Radius
- D = 2 * R
- Circumference = 2 π * Radius
- C = 2π R
- Area = Pi * Radius squared
- A = π R²

The circumference of a circle is 20 Pi feet. Find the radius.

What is the area of a circle with a diameter of 10cm?

What is the area of a circle with a diameter of 100cm?

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Circles Rectangles Squares Triangles Parallelograms