CHAPTER 2, SECTION A: THE SUM OF THE INTERIOR ANGLES OF A TRIANGLE
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.
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BACKGROUND MATERIAL (AND LINKS):
For this section of the course you should be familiar with
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