Formulae vital to the geometric aspect of a circle:

  • Circumfrence: c = {pi} * d
  • Area: a = {pi} * r^2
  • Diameter: d = 2r

    Arc Length - The distance from one point on the circumference to another point on the circumference traveling along the edge of the circle.

  • L = m / 360(deg) * c

  • Where:
  • r = radius
  • d = diameter
  • {pi} = 3.14159265358979323846... ~ 22/7
  • c = circumference
  • a = area
  • m = measure of the central angle