Basic Unit Circle

90° is equal to how many radians?

• π/4

• π/2

• π

• 2π

π/3 is equal to how many degrees?

• 30°

• 60°

• 90°

• 120°

What is the value of cosine at 135

• 0

• 1/2

• √2 /2

• -√2 /2

What is the value of sine at 210?

• 1/2

• -1/2

• √3 / 2

• -√3 / 2

What are the coordinates of 60° on the unit circle?

• (0, 1)

• (1/2, √3/2)

• (√3/2, 1/2)

• (√2/2, 1/2)

sinθ is positive in

• the 1st and 2nd quadrants

• the 1st and 3rd quadrants

• the 1st and 4th quadrants

• the 2nd and 3rd quadrants

cosθ is positive in

• the 1st and 2nd quadrants

• the 1st and 3rd quadrants

• the 1st and 4th quadrants

• the 2nd and 3rd quadrants

cos 4π/3

• -√3/2

• √3/2

• 1/2

• -1/2

cos 5π/6

• -1/2

• 1/2

• √3/2

• -√3/2

What is the value of sine at 150

• 0

• 1/2

• 1

• √3 / 2