The Unit Circle

cos(60°)

• 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

What is the exact value of sin 150°

• -1/2
• -√3/2
• 1/2
• √3/2

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