三角形角度计算器 — 公式

How to Find a Missing Triangle Angle

Formula

Angle C = 180° - Angle A - Angle B

The sum of all interior angles of a triangle is always 180 degrees. If you know two angles, you can find the third by subtracting their sum from 180.

Triangle Types by Angles

  • Acute: All angles less than 90°
  • Right: One angle exactly 90°
  • Obtuse: One angle greater than 90°

    • 计算示例

    A triangle has angles of 60° and 70°. Find the third angle.

    1. Angle C = 180° - 60° - 70°
    2. = 180° - 130°
    3. = 50°