Third angle of a triangle
Find a triangle’s missing interior angle.
Inputs
Use the units shown—
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Formula & explanation
C = 180° − A − B
Variables & units
- First angle
- ° · minimum 0, maximum 180
- Second angle
- ° · minimum 0, maximum 180
Worked example
50° and 60° leave a third angle of 70°.
Assumptions
Use interior angles of a non-degenerate Euclidean triangle.
Formula version 1.0.0. JavaScript floating-point arithmetic applies. Results display up to 6 decimal places; stored values retain available precision. Use the units shown.
Practice with an example
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