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 property of triangle

Exterior Angle Theorem - Definition, Proof, Examples

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

Right Angle: Types, Parts & Geometric Construction

Internal and external angles - Wikipedia

Interior Angles Of A Triangle (video lessons, examples, step-by-step solutions)

Exterior Angle Theorem: Definition, Proof, Examples, Facts, FAQs

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

Exterior and Interior Angles of Triangles: Concepts, Videos and Examples

Scalene Triangle: Definition, Properties, Formula, Examples

Triangle: Definition, Parts, Properties, Types, Formulas

Types of Triangles – Definitions, Properties, Examples – Full Potential Learning Academy

Angle sum properties of a triangle

Triangles in Geometry (Definition, Shape, Types, Properties & Examples)

Special right triangle - Wikipedia