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Ipatiy [6.2K]
3 years ago
6

Use the Law of Cosines to find the measure of ∠A. Round to the nearest degree.

Mathematics
1 answer:
denpristay [2]3 years ago
6 0

Answer:

Solution given:

a = 12, b = 5, c = 9

We have

: a² = b² + c² – 2bc cos A

12²=5²+9²-2×5×9 cos A

12²-25-81=-90 cos A

cos A=38/-90

A=cos -1(-19/45)

<u>A=115</u>°

<u> </u><u>is</u><u> </u><u>a</u><u> </u><u>required</u><u> </u><u>answer</u><u>.</u><u />

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