In this unit, we look at the three basic trigonometry ratios, sine, cosine, and tangent in relationship to the unit circle. Some of the new vocabulary terms are;
Initial side of an angle
Terminal side of an angle
Period, Midline, Amplitude, Frequency, Cycle, and Phase Shift
Area of a sector
We will look at the relationship between angle measure and radian measure and how to convert from one to another.
In addition, we will learn to graph sine and cosine functions. The transformations of these graphs are called changes in amplitude, period, midline, and phase shift. We will only concern ourselves with the first three. Phase shift will be introduced in Pre-Calculus.
One of the new things we encounter in this unit is the idea of a Radian. A radian is a unit of measure we use primarily with the unit circle but does has applications in the context of other circles as well. The video below is meant to help you understand what a radian is.