Sum of Exterior Angles of a Triangle

Sum of Exterior Angles of a Triangle

Introduction

Have you ever walked around a triangular track, turning at each corner? The turns you make are related to the exterior angles of a triangle. Understanding exterior angles helps us solve geometry problems, d...

Imagine drawing triangle ABC. If you extend one side, like BC, a new angle appears outside the triangle, called an exterior angle.

You already know the sum of three interior angles inside any triangle is always 180°.

But what about the exterior angles? Let’s find out.

Let’s extend all three sides of triangle A...