Calculadora da Circunferencia — Formula

How to Calculate the Circumference of a Circle

Formula

C = 2 × π × r

Or equivalently: C = π × d (where d is the diameter)

Where:

  • C = Circumference
  • π ≈ 3.14159
  • r = radius
  • d = diameter (2r)

    • Exemplo Resolvido

    Find the circumference of a circle with radius 7.

    1. C = 2 × π × 7
    2. = 14π
    3. = 14 × 3.14159
    4. ≈ 43.9823