The Unit Circle

What is the radius of the unit circle?

• 0
• 1
• 1/2
• √2/2

What is the value of cosine at 135

• 0
• 1/2
• √2 /2
• -√2 /2

30°

• π/2
• π/3
• π/4
• π/6

5π/6

• 120°
• 150°
• 210°
• 240°

330°

• 7π/6
• 9π/6
• 11π/6
• 13π/6

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 are the coordinates of 60° on the unit circle?

• (0, 1)
• (1/2, √3/2)
• (√3/2, 1/2)
• (√2/2, 1/2)