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Interior And Exterior Triangle Angles Calculator

Result

A60
B70
C50
Ext A120
Ext B110
Ext C130
↗ Math

Interior And Exterior Triangle Angles Calculator — free online calculator.

Formula

Method: Compute C = 180° − A − B, then each exterior angle as 180° minus its interior angle.
  • Interior And Exterior Triangle Angles Calculator calculates its result from Angle A, Angle B. It uses the formula Calculated with the verified ST Calculator runtime.. Change any input to recalculate the result instantly.
  • The main inputs are Angle A, Angle B. Enter them in the units and format shown in the calculator.
  • Keep comparable quantities in compatible units whenever the formula combines or compares them.
  • Changing any input above recalculates the result with the same calculation engine used by this page.

Example: Interior And Exterior Triangle Angles

Inputs
  • Angle A: 60
  • Angle B: 70

Using Angle A = 60, Angle B = 70, the calculated result is A: 60 | B: 70 | C: 50 | Ext A: 120 | Ext B: 110 | Ext C: 130.

Sample result: Calculating…

Frequently asked questions

What does the Interior And Exterior Triangle Angles calculate?

Interior And Exterior Triangle Angles Calculator — free online calculator.

Which values should I enter?

Enter Angle A, Angle B using the units and format shown beside each field.

What formula does this calculator use?

The calculator uses the following relationship: Method: Compute C = 180° − A − B, then each exterior angle as 180° minus its interior angle..

Why might my result differ from another source?

Results can differ when another source uses different units, rounding rules, conventions or assumptions. Compare the inputs and definitions before comparing results.

Does the result update automatically?

Yes. Changing an input updates the result using the same calculation engine shown on this page.

Page information

Updated: October 7, 2026