Finding Coordinates of Special Angles on a Unit Circle

What is the radius of a unit circle?

• 1
• 2
• 1/2
• 0

What are the coordinates of 180° on the unit circle?

• 0, 1

• 1, 0

• -1, 0

• 0, -1

What is the exact value of sin 150°

• 1/2

• -1/2

• √3/2

• -√3/2

cos(60°)

• 0

• 1

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

• (0, 1)

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 90°?

• ½
• undefined
• 1
• 0

What is tan 45°?

• 1
• ^√2/₂
• ^√3/₂
• ½

What is cos 30°?

• ^√3/₂
• ½
• ^√2/₂
• 1