AP Precalc Unit Circle Vocab

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Last updated 1:54 PM on 10/13/26
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11 Terms

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cos⁡θ\cos\theta

x/r

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sec⁡θ\sec\theta

r/x

3
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sin⁡θ\sin\theta

y/r

4
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csc⁡θ\csc\theta

r/y

5
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tan⁡θ\tan\theta

y/x

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cot⁡θ\cot\theta

x/y

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Pythagorean theorem

x² + y² = r²

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Coterminals

Radians that all land on the same terminal ray

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Radians

Natural representation of degrees

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Reference angle

The distance from the terminal ray to the x-axis

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What are the 3 most common Pythagorean triples?

  • 5,4,3

  • 13,12,5

  • 17,15,8