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Exterior Angle Theorem


In any triangle, if one of the sides is extended, the exterior angle is greater than both the interior and opposite angles.


See also

Exterior Angle

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References

Dunham, W. Journey through Genius: The Great Theorems of Mathematics. New York: Wiley, p. 41, 1990.

Referenced on Wolfram|Alpha

Exterior Angle Theorem

Cite this as:

Weisstein, Eric W. "Exterior Angle Theorem." From MathWorld--A Wolfram Web Resource. https://mathworld.wolfram.com/ExteriorAngleTheorem.html

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