unit circle

sin π/4

• √2∕2
• 1/2
• √3/2
• 0

cos 5π/6

• -1/2
• 1/2
• √3/2
• -√3/2

• 1
• -1
• 0
• √2/2

sinθ is positive in

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

Based on the unit circle, what is the value of sin?

• y

• x

• x/y

• y/x

Based on the unit circle, what is the value of cos?

• y

• x

• x/y

• y/x

What is the radius of a unit circle?

• 1
• 2
• 1/2
• 0

sin(7π/4)

• 1/2
• -√2/2
• √2/2
• -1/2

What is cos 60°?

• ½
• ^√3/₂
• ^√2/₂
• 1

What is sin 45°?

• 1
• ^√3/₂
• ½
• ^√2/₂