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OpenStudy (anonymous):
For △ABC, what is the value of cosC? 0.5 0.6 0.8 0.9
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OpenStudy (anonymous):
OpenStudy (anonymous):
what is the ratio for cosine? which two sides?
OpenStudy (anonymous):
idk
OpenStudy (anonymous):
cos = adjacent over hypotenuse. cos(angleC) = 72/90 angleC = inverse cosine(72/90) Thus, angleC = 0.64350110879328 Cos(0.64350110879328) = .8
OpenStudy (anonymous):
check out the Kahn Academy videos on trig the first one is the best 7 minutes I have ever spent listening to a trig explanation
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OpenStudy (anonymous):
If you wanna be more elegant about it... --> cos(arccos(4/5) = .8
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