Sine and Cosine Values in a Unit Circle

What is the radius of a unit circle?

• 1
• 2
• 1/2
• 0

cosθ is positive in

• the 1st and 2nd quadrants
• the 1st and 3rd quadrants
• the 1st and 4th quadrants
• the 2nd and 3rd quadrants

sinθ 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 cos 30°?

• ^√3/₂
• ½
• ^√2/₂
• 1

cos(45°)

What is the exact value of sin 150°

• -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)

cos 150^o

• -1/2

• 1/2

• √3/2

• -√3/2

What is cos 90°?

• ½
• undefined
• 1
• 0

What is sin 30°?

• ^√3/₂

• ½

• ^√2/₂

• 1