Unit Circle

cos (π/4)

• √3/2
• √2/2
• 1/2
• 1

Choose the best match for the graph.

• 45^o
• 90^o
• 135^o
• 180^o

What is the angle measure, in degrees, at the red marking on the unit circle?

• 30°
• 45°
• 60°
• 90°

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

Find cos(600°)

• (-1/2)

• (-√3/2)

• (√3/2)

• (√2/2)

What is the value of sine at 210?

• 1/2
• -1/2
• √3 / 2
• -√3 / 2

What is the value of cosine at 270

• 0
• 1
• -1

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