4 years ago

Find X. Round to the nearest tenth.

1 answer:

Pepsi [2]4 years ago

3 0

Answer:

X ≈ 117.9°

Step-by-step explanation:

The law of cosines formula is given. Solving it for C, we find ...

C = arccos((a^2 +b^2 -c^2)/(2ab))

where a and b are the sides adjacent to the angle of interest.

Here, we have ...

X = arccos((50^2 +55^2 -90^2)/(2·50·55)) = arccos(-2575/5500)

X ≈ 117.9°

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