Unit Circle IB AA SL QUESTIONS SET 1

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

• y coordinate

• x coordinate

• x coordinate / y coordinate

• radius of the unit circle

What is a complete revolution in radians?

• π
• 2π
• (1/2)π

• 1

• 30

• 60

• 120

• 45

TRUE or FALSE: For a positive angle, we move anticlockwise around the unit circle.

• TRUE

• FALSE

cos(π) =

• 0
• 1
• -1
• 1/2

sin(π/2) - cos(π/8) =

• -0.924

• 0.0761

• 1.422

• 0.924

Convert 150⁰ to radians

• 5π/6
• 3π/4
• 7π/6
• 2π/3

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)

Convert the following to degrees:
-8π/5 radians

• -288⁰
• -260⁰
• -275⁰

• TRUE

• FALSE