Trigonometric Ratios and the Unit Circle

If you are given the hypotenuse and an adjacent side, which trig function should you use?

• sine

• cosine

• tangent

• cotangent

sin(120^o)

• - ½

• √3/2

• 2√3 /3

• ½

cos(2π)

• 0

• 1

• UND

• -1

• √2/2

• -√3/2

• ½

• -√2/2

cos(2π/3)

• - ½

• 2√3 /3

• ½

• -2√3 /3

cot(45^o)

• ½

• 1

• -1

• √2

How many Unit Circle HW assignments did you have in Unit 5? These are titled "Unit Circle HW."

• 1

• 2

• 3

• 4

Using our notes from 1/30 on Solving Right Triangles, Inverse Trig Ratios are used to determine the _______ that goes with a given ratio.

• side

• angle

• trig function

• unit circle

Fill in the definition from your notes on Using Radian Measure from 1/04. An angle in ___________ has its vertex on the origin and one ray on the positive x-axis.

• standard position

• initial side

• terminal side

• quadrantal angles

Solve for the misssing distance

• 18.9

• 19.5

• 47

• 27.5