Pretest

Question 1

Which of the following best explains why cosine 2 pi over 3 is not equal to cosine 5 pi over 3 ?

Revolt · Accepted Answer

D: Cosine is negative in the second quadrant and positive in the fourth quadrant.

Question 2

Which of the following is true of the location of the terminal side of an angle, theta , whose sine value is 1 half ?

Revolt · Accepted Answer

C: theta  has a reference angle of  30 degrees  and is in Quadrant I or II

Question 3

The terminal side of an angle measuring pi over 6 radians intersects the unit circle at what point?

Revolt · Accepted Answer

D: open paren 1 half comma the fraction with numerator square root of 3 and denominator 2 close paren

Question 4

Which expression is equivalent to sine 7 pi over 6 ?

Revolt · Accepted Answer

D: sine pi over 6

Question 5

What is the reference angle for a 240 degrees angle?

Revolt · Accepted Answer

B: 60 degrees

Question 6

On the unit circle, where 0 is less than theta comma theta is less than or equal to 2 pi , when is tangent theta undefined?

Revolt · Accepted Answer

B: theta is equal to pi over 2  and  theta is equal to 3 pi over 2

Question 7

Which equation can be used to determine the reference angle, r , if theta is equal to 7 pi over 12 ?

Revolt · Accepted Answer

D: r is equal to pi minus theta

Question 8

Which of the following explains why cosine 60 degrees is equal to sine 30 degrees using the unit circle?

Revolt · Accepted Answer

C: The side opposite a  30 degrees  angle is the same as the side adjacent to a  60 degrees  angle in a right triangle. On a unit circle, the  y times sine  distance of a  30 degrees  angle is the same as the  x times cosine  distance of a  60 degrees  angle.

Question 9

Which of the following best explains why tangent 5 pi over 6 is not equal to tangent 5 pi over 3 ?

Revolt · Accepted Answer

B: Tangent is negative in the second quadrant and positive in the fourth quadrant.

Question 10

Which expression can be used to determine the reference angle for an angle, x , measuring 150 degrees ?

Revolt · Accepted Answer

B: 180 degrees minus x

Pretest Answers

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