CALCULATOR
Exterior Angles of a Triangle Calculator
exterior angles of a triangle. Example: Angle in degrees: 60 degrees gives 120 degrees. Find one adjacent exterior angle from its corresponding interior angle, not arbitrary reflex angles. Flat Euclidean geometry in the stated units. No waste, thickness, structural advice or curved-earth inference. Only the stated forward job is supported; display rounding does not change the calculation.
Find one adjacent exterior angle from its corresponding interior angle, not arbitrary reflex angles. Flat Euclidean geometry in the stated units. No waste, thickness, structural advice or curved-earth inference. Only the stated forward job is supported; display rounding does not change the calculation. Derivation: Interior and adjacent exterior lie on a straight line.
Accepted inputs: Angle in degrees: 0.001 to 179.999 degrees.
How the calculation works
adjacent exterior = 180°−interior
Worked example
With angle in degrees 60 degrees, exterior angles of a triangle is 120 degrees.
Assumptions and limits
Find one adjacent exterior angle from its corresponding interior angle, not arbitrary reflex angles. Flat Euclidean geometry in the stated units. No waste, thickness, structural advice or curved-earth inference. Only the stated forward job is supported; display rounding does not change the calculation. Derivation: Interior and adjacent exterior lie on a straight line.