When a circle has a diameter (all the way across the circle) of 1. Then the circumference (all the way around the circle) is Pi (3.14159265...)
When a circle has a radius of 1. The distance half way around the circle is Pi.
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When a circle has a diameter (all the way across the circle) of 1. Then the circumference (all the way around the circle) is Pi (3.14159265...)
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| Circle illustration with circumference (C) in black, diameter (D) in cyan, radius (R) in red, and centre or origin (O) in magenta. | ||
| Circumference = π × diameter = 2 × π × radius. | When a circle has a radius of 1. The distance half way around the circle is Pi. |
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