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AAA Triangle Theorem Calculator

Find a triangle’s third angle from two known angles in an AAA configuration.

Angle C (degrees): -
Visual representation

AAA Triangle Theorem Calculator diagram

The diagram updates with your entries and is illustrative, not necessarily drawn to scale.

Calculation explained

How this result was calculated

The formula, your substituted values, and the evaluated result are shown below.

AAA determines triangle shape but not its absolute side lengths. The two entered angles must be positive and total less than 180°.
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How the AAA Triangle Theorem Calculator works

Find a triangle’s third angle from two known angles in an AAA configuration.

Formula

180-angleA-angleB

How to use this calculator

  1. Enter every measurement using one consistent length or angle unit.
  2. Select Calculate to evaluate the formula.
  3. Review the substituted values in the calculation explanation.

Interpretation and limitations

AAA determines triangle shape but not its absolute side lengths. The two entered angles must be positive and total less than 180°. Decimal answers are rounded for display; retain additional precision for subsequent calculations.

Geometry collection

This calculator belongs to the Trigonometry section of the Math calculator library.

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