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9. Unit Circle

Reference Angles

9. Unit Circle

Reference Angles

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Reference Angles on the Unit Circle

Reference Angles on the Unit Circle

Trig Values in Quadrants II, III, & IV

Trig Values in Quadrants II, III, & IV

Coterminal Angles on the Unit Circle

Coterminal Angles on the Unit Circle

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Multiple Choice
Identify the reference angle of each given angle.
120°
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Multiple Choice
Identify the reference angle of each given angle.
$\frac{7\pi}{4}$ rad
324
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3
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Multiple Choice
Identify the reference angle of each given angle.
210°
368
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4
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Multiple Choice
Identify what angle, $\theta$ , satisfies the following conditions.
$\sin\theta=\frac12$ ; $\tan\theta$ < $0$
289
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4
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