Unit Circle Reference Angles

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

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

• y/r
• x/r
• r/y
• y/x

What is the radius of the unit circle?

• 0
• 1
• 1/2
• √2/2

cos (π/4)

• √3/2
• √2/2
• 1/2
• 1

sin(315^o)

• √2/2
• -√3/2
• ½
• -√2/2

cos(π)

• √3/2
• -√2/2
• -1
• 1

sin (π/2)

• √3/2
• √2/2
• 1/2
• 1

tan(300^o)

• -√3 /3
• ½
• 2√3 /3
• -√3

cos(30^o)

• - ½
• √3/2
• 2√3 /3
• ½