How to use it
- Identify the relevant total: 180° on a line or triangle, 360° around a point.
- Add known angles.
- Subtract from the total.
See it in action
Triangle angles 48° and 67° leave 180−115=65°.
How to verify it
48+67+65=180.
Use Angle Sums as Constraints
Known angle totals can turn geometry into simple subtraction.