Circle Calculator
Choose what you know and get the radius, diameter, circumference and area.
WhatMathsCIR-10
Example
A circle with radius 5 has diameter 10, circumference 2π × 5 ≈ 31.416 and area π × 5² ≈ 78.540.
Choose what you know and get the radius, diameter, circumference and area.
A circle with radius 5 has diameter 10, circumference 2π × 5 ≈ 31.416 and area π × 5² ≈ 78.540.