4 years ago

A. 33.9 B. 57.7 C. 46.3 D. 85.7

1 answer:

7 0

The answer is A. Here's how you get it. Law of cosines here looks like this:
17^2 = 22^2 + 30^3 - [2(22)(30)cosA]; which simplifies to 289=484+900-1320(cosA). Doing that math gives you 289 = 1384 - 1320(cosA), and -1095 = -1320(cosA). Divide both sides by -1320 to get
.829545 = cos A. Now use the inverse cosine on your calculator to get the missing angle measure.

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Step-by-step explanation:

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Answer:

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Step-by-step explanation:

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