Lesson 6.2 ~ Angles and the Unit Circle I can find the ... · circle radius 1 unit You can use the...

15
Lesson 6.2 ~ Angles and the Unit Circle Objectives: I can find the degree measure of an angle in standard position. I can sketch the degree measure of an angle in standard position. I can identify coterminal angles. I can find the sine and cosine of angles.

Transcript of Lesson 6.2 ~ Angles and the Unit Circle I can find the ... · circle radius 1 unit You can use the...

Page 1: Lesson 6.2 ~ Angles and the Unit Circle I can find the ... · circle radius 1 unit You can use the symbol O for the measure of an angle in standard position. Key Concepts Cosine and

Lesson 6.2 ~ Angles and the Unit Circle

Objectives:

• I can find the degree measure of an angle in standard position. • I can sketch the degree measure of an angle in standard position. • I can identify coterminal angles. • I can find the sine and cosine of angles. 

Page 2: Lesson 6.2 ~ Angles and the Unit Circle I can find the ... · circle radius 1 unit You can use the symbol O for the measure of an angle in standard position. Key Concepts Cosine and
Page 3: Lesson 6.2 ~ Angles and the Unit Circle I can find the ... · circle radius 1 unit You can use the symbol O for the measure of an angle in standard position. Key Concepts Cosine and

Let’s look at some definitions:

An angle is in STANDARD POSITION when the vertex is at the origin, and one ray is on the positive x‐axis.

The ray on the positive x‐axis is called the INITIAL SIDE.

The other ray forming the angle is the TERMINAL SIDE.

We measure angles by measuring the amount of rotation from the initial side to the terminal side.

Page 4: Lesson 6.2 ~ Angles and the Unit Circle I can find the ... · circle radius 1 unit You can use the symbol O for the measure of an angle in standard position. Key Concepts Cosine and

The angle measure is POSITIVE when the rotation from the initial side is counterclockwise.

The angle measure is NEGATIVE when the rotation from the initial side is clockwise.

Page 5: Lesson 6.2 ~ Angles and the Unit Circle I can find the ... · circle radius 1 unit You can use the symbol O for the measure of an angle in standard position. Key Concepts Cosine and
Page 6: Lesson 6.2 ~ Angles and the Unit Circle I can find the ... · circle radius 1 unit You can use the symbol O for the measure of an angle in standard position. Key Concepts Cosine and
Page 7: Lesson 6.2 ~ Angles and the Unit Circle I can find the ... · circle radius 1 unit You can use the symbol O for the measure of an angle in standard position. Key Concepts Cosine and

Without looking at a graph, how can you show that an angle of 3000 is coterminal with an angle of ­600?

How many coterminal angles are possible for an angle of 600?

Page 8: Lesson 6.2 ~ Angles and the Unit Circle I can find the ... · circle radius 1 unit You can use the symbol O for the measure of an angle in standard position. Key Concepts Cosine and

(page 389)

Page 9: Lesson 6.2 ~ Angles and the Unit Circle I can find the ... · circle radius 1 unit You can use the symbol O for the measure of an angle in standard position. Key Concepts Cosine and

(page 389)a positive and a negative

Page 10: Lesson 6.2 ~ Angles and the Unit Circle I can find the ... · circle radius 1 unit You can use the symbol O for the measure of an angle in standard position. Key Concepts Cosine and

Remember?

Page 11: Lesson 6.2 ~ Angles and the Unit Circle I can find the ... · circle radius 1 unit You can use the symbol O for the measure of an angle in standard position. Key Concepts Cosine and
Page 12: Lesson 6.2 ~ Angles and the Unit Circle I can find the ... · circle radius 1 unit You can use the symbol O for the measure of an angle in standard position. Key Concepts Cosine and

(page391‐392)

Page 13: Lesson 6.2 ~ Angles and the Unit Circle I can find the ... · circle radius 1 unit You can use the symbol O for the measure of an angle in standard position. Key Concepts Cosine and

(page391‐392)

three decimal places.

NOTE:  Before you use your calculator to find the cosine or sine of an angle, you must make sure that it is in the correct mode.  Press the “Mode” button on your calculator, scroll down to the “radian degree” line, highlight “degree” and press enter.

Page 14: Lesson 6.2 ~ Angles and the Unit Circle I can find the ... · circle radius 1 unit You can use the symbol O for the measure of an angle in standard position. Key Concepts Cosine and

three decimal places.

Page 15: Lesson 6.2 ~ Angles and the Unit Circle I can find the ... · circle radius 1 unit You can use the symbol O for the measure of an angle in standard position. Key Concepts Cosine and