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# Coterminal and Reference Angles (Grades 11-12)

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## Coterminal and Reference Angles

1.
Reference angles must be
1. in degrees.
2. positive and acute.
3. positive and obtuse.
2.
Co-terminal angles are angles that share a terminal side.
1. True
2. False
3.
What is the reference angle for $(5pi)/6$?
1. $pi/6$
2. $pi/3$
3. $2pi/6$
4. $2pi/3$
4.
What is the reference angle for $170deg$?
1. 190°
2. 80°
3. 100°
4. 10°
5.
What reference angle would be used to calculate the trig function values for $120deg$?
1. $0deg$
2. $30deg$
3. $45deg$
4. $60deg$
5. $90deg$
6.
What is the reference angle for 210°?
1. 30°
2. 45°
3. 150°
4. none of the above
7.
The terminal side of an angle measuring $(-2pi)/3$ radians lies in which quadrant?
8.
The terminal side of a $-1545deg$ angle lies in what quadrant?
1. Q I
2. Q II
3. Q III
4. Q IV
9.
Which of the following is coterminal to $-(5pi)/12$ ?
1. $-(7pi)/12$
2. $(5pi)/12$
3. $(7pi)/12$
4. $(17pi)/12$
5. $(19pi)/12$
10.
Which of these angles is coterminal to $35deg$?
1. 325°
2. -325°
3. 145°
4. 215°
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