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3 years ago

In angle ABC, AB = 2.5 m, BC = 3.2 m and AC = 2.9 m. Use the Cosine Law to find

Mathematics

1 answer:

Triss [41]3 years ago

3 0

9514 1404 393

Answer:

∠A ≈ 72°

Step-by-step explanation:

Fill in the given numbers and do the arithmetic.

cos A = (2.9² +2.5² -3.2²)/(2(2.9)(2.5)) = 4.42/14.5

The inverse cosine function is used to find the angle, given its cosine.

A = arccos(4.42/14.5)

∠A ≈ 72°

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