Circles Unit 3 Pre-Assessment

What is the radius of a unit circle?

• 1

• 2

• 1/2

• 0

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 are the coordinates of 60° on the unit circle?

• (0, 1)

• (1/2, √3/2)

• (√3/2, 1/2)

• (√2/2, 1/2)

What is sin 45°?

• 1
• ^√3/₂
• ½
• ^√2/₂

What is the equation of the circle shown in the graph?

Mathematical Equivalence

ON

What is cos 90°?

• ½

• undefined

• 1

• 0

What is cos 30°?

• ^√3/₂

• ½

• ^√2/₂

• 1

What is a complete circle in radians?

• π

• 2π

• 1/2 π

• 1

Convert 150⁰ to radians

• 5π/6

• 3π/4

• 7π/6

• 2π/3

What is 7π/4 radians in degrees?

• 300

• 135

• 315

• 45