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Genrish500 [490]
4 years ago
15

Find the the measure of angle C

Mathematics
1 answer:
andrey2020 [161]4 years ago
8 0

Answer:

65.4

Step-by-step explanation:

Use the Law of Sines here.  The Law is as follows:

\frac{sinA}{a}=\frac{sinB}{b}=\frac{sinC}{c}

We only have need for 2 of those 3 proportions.  Since we can have only 1 unknown in a single equation, we have to use angle C as that unknown.  That means that other angle and side have to be given in the problem.  Angle B is given as 45 and side b is given as 7, so we will use those.

\frac{sinC}{9}=\frac{sin45}{7}

We solve for sinC:

sinC=\frac{9sin45}{7}

Doing that on our calculator gives us

sinC = .9091372901

Taking the inverse sin in degree mode gives you that angle C = 65.4

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