KIM MALTMAN'S MINI-COURSE ON TRIG BASICS

CHAPTER 2, SECTION A: THE SUM OF THE INTERIOR ANGLES OF A TRIANGLE

OVERVIEW:

This section of Chapter 2 provides an explicit geometrical demonstration of why it is that the sum of the three interior angles of any triangle is equal to π radians (180 degrees). This information will be needed in a number of places later in the course.

---

A list of the background material needed to follow the contents of this section is given below. If you are unfamiliar with one of the background topics, or feel you would like to review it, click on the relevant link.

If you are already familar with this background information, you can proceed directly to the contents of the current section of the course by clicking HERE.

---

BACKGROUND MATERIAL (AND LINKS):

For this section of the course you should be familiar with

• the geometrical meaning of angles and angular measure, as well as the basic conventions used in assigning an angle to a given direction in the plane (reviewable by reading (or re-reading) Section (b), of Chapter 1 of the course); and

• the use of either radian or degree units for measuring angles (reviewable by reading (or re-reading) Section (c), of Chapter 1 of the course).

CLICK HERE TO PROCEED TO THE CONTENTS OF THIS SECTION OF THE COURSE