2 years ago

HELP!! TRIG LAW OF COSINES

Mathematics

1 answer:

vivado [14]2 years ago

4 0

Answer:

C ≈ 95.7°

Step-by-step explanation:

Law of cosines:

c² = a² + b² − 2ab cos C

where a, b, and c are the sides of the triangle, and C is the angle opposite of side c.

9² = 5² + 7² − 2(5)(7) cos C

81 = 25 + 49 − 70 cos C

7 = -70 cos C

-1/10 = cos C

C ≈ 95.7°

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