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.

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

Angles in a Quadrilateral: Formula, Properties, Examples, Facts

Angles of Triangles Worksheets

Angles In A Triangle - GCSE Maths - Steps, Examples & Worksheet

Exterior Angles of Triangle - Definition, Formula, Properties

Angle Sum Property of a Triangle: Definition, Theorem, Formula

How to Calculate the Sum of Interior Angles: 8 Steps

Angle sum properties of a triangle

Unit 5 Section 6 : Finding Angles in Triangles

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

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

Triangles and Trigonometry

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