Unit Circle 20 Questions

What is the reference angle for 330 degrees?

[Remember, a reference angle must be in the top right]

• 30

• 45

• 60

• 210

• none

What is the reference angle for 117 degrees?

How many radians is 225 degrees?

• π/4

• 3π/4

• 5π/4

• 225π/4

• none

Find the coordinates of the point at 50 degrees on the unit circle.

• (50,40)

• (.64,.77)

• (.77,.64)

• (40,50)

• None of these

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

The angle π/12 radians would be located in which quadrant?

• I

• II

• III

• IV

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

• 225

• √2/2

• -√2/2

• 1/2

• none of these

Which of the following has a positive cosine and a negative sine?

• 11

• 111

• 211

• 311

• none of these