Circumference Calculator

Find a circle's circumference and diameter from the radius.

Circumference 43.982

Diameter 14

Formula: circumference = 2πr

Step-by-step with your numbers:

1. Values used:

2. Radius = 7

4. Circumference = 43.982

5. Diameter = 14

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The distance around a circle.

The math behind it

circumference = 2 × π × radius = π × diameter.

Radius 7 → 43.98.

From circumference to radius?

radius = circumference ÷ (2π).