Learning about Exterior Angles
Introduction
Now that you've learnt about Triangles and other laws related to angles, it is time to put them together to discover a new interesting property about triangles. :)
![in the image above shows [math]\bigtriangleup[/math]ABC, when the vertex BC is extended to form CD, a new angle is formed.
[math]\angle[/math]d is formed. it is the exterior angle to [math]\bigtriangleup[/math]ABC.
](https://www.geogebra.org/resource/p6wjqudV/5dmGHtqOG700UqeN/material-p6wjqudV.png)
AIM
The aim of today's activity is to discover the relationship between angle d and the other angles in the triangle.
Task
1.