Warm-up 12/6 Unit Circle

Convert 150⁰ to radians

• 5π/6
• 3π/4
• 7π/6
• 2π/3

What is 7π/4 radians in degrees?

• 300
• 135
• 315
• 45

What is the exact coordinates of  3π/4 on the unit circle?

• (−√2∕2, √2∕2)
• (−√2∕2, −√2∕2)
• (−√3∕2, −√2∕2)
• (√2∕2, −√2∕2)

What is the radius of a unit circle?

• 1
• 2
• 1/2
• 0

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

sin (π/2)

• √3/2
• √2/2
• 1/2
• 1

cos (π/4)

• √3/2
• √2/2
• 1/2
• 1

cos(π)

• √3/2
• -√2/2
• -1
• 1

cos(5π/3)

• -√2/2
• -1/2
• 1/2
• √3/2