Evaluate Sine Cosine Tangent Unit Circle

cos 0 =

• 0

• ¹/₂

• ^√2/₂

• ^√3/₂

• 1

cos π =

• 0

• 1

• -1 

• undefined

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 cosine?

• y

• x

• x/y

• y/x

sinθ is positive in

• the 1st and 2nd quadrants

• the 1st and 3rd quadrants

• the 1st and 4th quadrants

• the 2nd and 3rd quadrants

Which function corresponds to x coordinate on the unit circle?

• sine

• cosine

• tangent

• secant

cosθ is positive in

• the 1st and 2nd quadrants

• the 1st and 3rd quadrants

• the 1st and 4th quadrants

• the 2nd and 3rd quadrants

sin π =

• 0

• 1

• -1 

• undefined

What is the radius of the unit circle?

• It varies.

What radian measure corresponds to the point 

• π/4

• 3π/2

• 5π/4

• 7π/3