The Unit Circle

Unit Circle Radians and Degrees

100

π/6

30^o

200

210 degrees

What is 7π/6

300

5/3π

300^o

400

0 degrees

What is 0

500

260⁰

13π/9

Using a Calculator to Evaluate Sine, Cosine, Tangent*Round to hundredths

100

sin180^o

-1

200

cos 7pi/6

-.87

300

tan370^o

.18

400

sin 18pi/39

.99

500

cos792^o

.31

Unit Circle Quadrants

100

What trig ratio (sine,cosine,tangent) is positive in Q1?

What is all

200

What trig ratio is negative in Q2 (sine,cosine,tangent)?

What is cosine and tangent.

300

What values are positive in Q4 (sine,cosine,tangent)?

What is cosine.

400

What values are negative in Q3 (sine,cosine,tangent)?

What is sine and cosine.

500

What trig ratios are negative in Q1 (sine,cosine,tangent)?

What is NONE

Sine, Cosine, Tangent in Coordinate Plane

100

Sine is what coordinate?

What is y

200

Cosine is what coordinate?

What is x

300

What is the tangent ratio in the coordinate plane?

What is y/x

400

What is the hypotenuse in the unit circle?

What is 1.

500

At which angles do sinx = cosx in the coordinate plane?

*Hint: There are two angles where this happens! 

What is 45 degrees and 225 degrees.

Evaluating Exact Values of Trig in Coordinate Plane.

100

Sin45^o

sq. rt 2/2

200

Cos240^o

-1/2

300

tan pi

0

400

tan 2pi/3

-sq rt 3

500

Tan 3pi/2

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