Exterior Angles of Triangle - Definition, Formula, Properties

When any side of a triangle is extended, the angle that is formed with this side and its adjacent side is called the exterior angle of a triangle. There are three exterior angles in a triangle.

Exterior Angle of a Triangle – Definition, Theorem, Proof, Examples

Interior & Exterior Angles of a Triangle, Overview & Examples - Lesson

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Exterior Angle Theorem (examples, solutions, worksheets, videos, activities)

Exterior Angle of a Triangle Passy's World of Mathematics

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Internal and external angles - Wikipedia

Exterior Angle of a Triangle – Definition, Theorem, Proof, Examples

Exterior Angles in a Triangle - MathBitsNotebook (Geo)

Interior and Exterior Angles of Triangles (Video & Examples)

What is the Exterior Angle Theorem? - Alternate Triangle Calculation Guide