Exact Value from Unit Circle

What is the value of sine at 210°?

• 1/2

• -1/2

• √3 / 2

• -√3 / 2

What are the coordinates of 180° on the unit circle?

• (0, 1)

• (1, 0)

• (-1, 0)

• (0, -1)

What is x if sin(x) = 0.5?

• 30^o

• 30^o or 150^o

• 150^o

• -30^o or 30^o

Find the exact value of sin(120°).

Find the exact value of cos(3π/2).

• 1

• 0

• -1

• 270°

Find the exact value of tan(π/4).

• 45°

• 1

Find the height of the point located at 170 degrees on the unit circle.

Then ROUND your answer to TWO DECIMAL PLACES

Write the EXACT coordinates of the point located at 60 degrees on the unit circle.

• (.5,.9)

• (1/2,√3/2)

• (√3/2,1/2)

• (.866,.5)

• None of these

What is the sine value of π/4 radians?

• .785

• 45

• √2/2

• -√2/2

• none of these

What is the cosine value of 5π/4 radians?

• 225

• √2/2

• -√2/2

• 1/2

• none of these