Evaluating Trig Functions on the Unit Circle

What is the radius of a unit circle?

• 1

• 2

• 1/2

• 0

What is the exact value of 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

cosθ is positive in

• the 1st and 2nd quadrants

• the 1st and 3rd quadrants

• the 1st and 4th quadrants

• the 2nd and 3rd quadrants

What trig function is positive in quadrant 3?

• all of them

• sine
  

• cosine

• tangent

What quadrant is positive in quadrant 4?

• sine

• cosine

• tangent

• none

*

• csc x

• sec x

• cot x

• tan x

*

• csc x

• sec x

• cot x

• tan x

The hypotenuse of any right triangle from the center of the unit circle to an edge is always

• 1

• sqt2/2

• sqt3/2

• 1/2

Based on your unit circle sin(30^o)=

• sqt2/2

• 1/2

• 1

• sqt3/2