Sine and Cosine Unit Circle

• 1
• -1
• 0
• √2/2

What is the radius of a unit circle?

• 1

• 2

• 1/2

• 0

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

• y

• x

• x/y

• y/x

Which statement(s) are true about sine and cosine functions in Quadrant 4?

• Sine is negative.

• Sine is positive.

• Cosine is negative.

• Cosine is positive.

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

• y/r

• x/r

• r/y

• y/x

sin 150

• -1/2

• -√3/2

• 1/2

• √3/2

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 your unit circle sin(120^o)=

• -1/2

• √3/2

• -√2/2

• -√3

sin 5π/6

• √3/2

• -√3/2

• 1/2

• -1/2