Trig / Precalculus – convert degrees to radians

Q: Convert from degrees to radians:  330°

Answer:

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Explanation:

 

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My TI-84 Plus program ‘DEG2RAD’ will convert this for you.

 

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Geometry – Triangles

Q: In triangle ABC below, what is sin C ?
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Answer: 4/5
Explanation:  Use the Pythagorean Theorem or the 3-4-5 Pythagorean triple to find out that the hypotenuse is 10.
Then, sin C = (opposite)/(hypotenuse) = 8/10 = 4/5.
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