Trig Unit Circle

• 0
• 1/2
• √3/2
• 1

cos 150^o

• -1/2

• 1/2

• √3/2

• -√3/2

sin 7π/6

• 1/2
• -1/2
• √3/2
• -√3/2

What is the radius of a unit circle?

• 1
• 2
• 1/2
• 0

• -1/2
• -√3/2
• 1/2
• √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

What is sin 45°?

• 1
• ^√3/₂
• ½
• ^√2/₂

• ½
• undefined
• 1
• 0