Exterior Angles of Triangle - Definition, Formula, Properties
By A Mystery Man Writer
Description
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.
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Question Video: The Type of the Exterior Angle of an Isosceles Triangle
![Exterior Angles of Triangle - Definition, Formula, Properties](https://www.onlinemathlearning.com/image-files/exterior-angle-theorem.png)
Exterior Angle Theorem (video lessons, examples, step-by-step solutions)
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Angle Sum Property, Theorem, Proof
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Internal and external angles - Wikipedia
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What is the Exterior Angle Theorem? - Alternate Triangle Calculation Guide
Lesson Explainer: Interior and Exterior Angles of Triangles
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Special right triangle - Wikipedia
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Exterior Angle of a Triangle Passy's World of Mathematics
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Angles of Triangles Worksheets
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Angles In A Triangle - GCSE Maths - Steps, Examples & Worksheet
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