几何

圆形计算器

计算圆的半径、直径、周长和面积

使用方法
  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.

公式

Circle formulas:

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