Unit Circle

• 1

• 1

cos(π)

• -1

• 1

tan 0

• undefined

• 1

• 0

• -1

tan(45^o)

• undefined

• 1

• -1

• 0

sin 30°

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