Circle with Radius 5 — Circumference, Area and Diameter
Enter any one measure of a circle — radius, diameter, circumference or area — and get the other three instantly, with every formula shown with your numbers substituted in.
Result
This page opens the circle calculator with the radius already set to 5 and the answers computed on load: the diameter is 10, the circumference is 2 × π × 5 = 10π ≈ 31.415927, and the area is π × 5² = 25π ≈ 78.539816.
The exact forms matter as much as the decimals. Because the radius is a whole number, both derived measures are clean multiples of π: C = 10π and A = 25π. Geometry courses usually accept — and often require — that exact form, since it carries no rounding error; the calculator prints it right above the decimal approximations.
Change the value or the known measure to explore any other circle: the formulas re-render with the new numbers substituted in, so the page doubles as a worked example generator. Everything is calculated locally in your browser.