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CAN SOMEONE HELP QUICK PLEASE? RIGHT ANSWERS ONLY

CAN SOMEONE HELP QUICK PLEASE? RIGHT ANSWERS ONLY-example-1
User Felix Guo
by
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1 Answer

3 votes

Answer:

B. 104.48

Explanation:

You want the measure of angle A in triangle ABC with sides a=16, b=12, c=8.

Law of Cosines

The law of cosines lets us find angle A from ...

a² = b² +c² -2bc·cos(A)

Solving for A gives ...

A = arccos((b² +c² -a²)/(2bc)) = arccos((12² +8² -16²)/(2·12·8))

A = arccos(-1/4) ≈ 104.48°

Angle A is about 104.48°, choice B.

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CAN SOMEONE HELP QUICK PLEASE? RIGHT ANSWERS ONLY-example-1
User Rafalmag
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