4.01 Radian and Degree Measures

Introduction

Trigonometry is the branch of mathematics that deals with the relationships between the sides and the angles of triangles and the calculations based on them, particularly the trigonometric functions. In this section, you will learn what an angle is, how to define angles, and how to measure angles.

Let's start by looking at examining the relationship between radians and angles using a unit circle. You'll do this using Geogebra: Trigonometric Ratios of General Angles and Reference Angle. Open the 4.01 Explore. Complete the activity and submit your work to the 4.01 Explore Dropbox.