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lord [1]
3 years ago
6

In △ABC, m∠A=57°, m∠B=37°, and a=11. Find c to the nearest tenth.

Mathematics
1 answer:
kykrilka [37]3 years ago
8 0

Answer:

c=13.1\ units

Step-by-step explanation:

step 1

Find the measure of angle C

Remember that the sum of the interior angles of a triangle must be equal to 180 degrees

so

A+B+C=180°

we have

A=57°

B=37°

substitute

57°+37°+C=180°

94°+C=180°

C=180°-94°=86°

step 2

Find the measure of side c

Applying the law of sines

\frac{a}{sin(A)}=\frac{c}{sin(C)}

substitute

\frac{11}{sin(57\°)}=\frac{c}{sin(86\°)}

c=\frac{11}{sin(57\°)}sin(86\°)

c=13.1\ units

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