幾何学

円計算機

円の半径・直径・周長・面積を計算

使い方
  1. Select the property of the circle you already know (Radius, Diameter, Circumference, or Area).
  2. Enter the value.
  3. Click Calculate Circle to compute all other properties simultaneously.

計算式

Circle formulas:

  • Diameter (d) = 2 × Radius (r)
  • Circumference (C) = 2 × π × Radius (r) = π × Diameter (d)
  • Area (A) = π × Radius (r)²