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 and Interior Angles of Triangles: Concepts, Videos and Examples

Angle Sum Property, Theorem, Proof

Exterior Angles of Triangle - Definition, Formula, Properties

Exterior Angle Theorem (video lessons, examples, step-by-step solutions)

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

Right Angle Triangle - GCSE Maths Steps, Examples & Worksheet

Unit 5 Section 6 : Finding Angles in Triangles

Interior and Exterior Angles of Triangles (Video & Examples)

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

Isosceles Triangle - Definition, Angles, Properties, Examples

Angles in triangles and quadrilaterals - KS3 Maths - BBC Bitesize

Properties of a Triangle - Formulas, Theorems, Examples

Obtuse Triangle: Definition, Types, Formulas

Types of Triangles: Acute and Obtuse