Convert between circle diameter and circumference. A 1 m diameter circle has a circumference of π ≈ 3.1416 m and an area of 0.785 m².
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| Diameter (m) | Circumference (m) | Area (m²) |
|---|
How to convert diameter to circumference
C = π × diameter. Reverse: diameter = C ÷ π. Use π ≈ 3.14159.
Common mistake
Using 2π (which is C for radius) instead of π. C = π × diameter = 2π × radius — keep the radius/diameter choice consistent.