Angles and the Unit Circle Day 2

Topic: Angles and The Unit Circle Aim: How do we calculate the cosine and sine of an angle?
Do Now: Describe coterminal angles and give an example of two angles that are coterminal. Sketch them.
2 Day Lesson Plan
All worksheets must have your name on it
They must ALL be dropped in the white basket before the end of the period OR you will receive NO CREDIT for your work!!!
Vocabulary
Standard position
Initial side
Terminal side
Coterminal angles
Unit circle
Cosine of θ
Sine of θ
Coterminal angles
Problem 3 Page 830 Handout
Why is 60° not coterminal with the other three angles?

Try the “Got it” #3


Unit Circle
Radius of 1
Center at origin of the coordinate plane
Points on the unit circle are related to periodic functions
Use Greek letter theta θ for angle measure.

Cosine and Sine of an angle
The cosine of θ (cosθ) is the x coordinate of the point at which the terminal side of the angle intersects the unit circle.
The sine of θ (sin θ) is the y-coordinate.
Exit slip
Page 345 Handout

Standardized Test Prep

Questions 1-4
Classwork
Page 347 handout

#1 -11, 12 – 15

Page 348 Handout 43 – 45, 52-54, 55, 61