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Tamiku [17]
2 years ago
10

Can someone help me with this

Mathematics
1 answer:
Tems11 [23]2 years ago
4 0

Answer: 8.2

Step-by-step explanation:

As angles in a triangle add to 180 degrees,

\angle A=180^{\circ}-121^{\circ}-31^{\circ}=28^{\circ}

So, by the Law of Sines,

\frac{a}{\sin A}=\frac{b}{\sin B}\\\\a=\frac{b \sin A}{\sin B}\\\\a=\frac{9 \sin 28^{\circ}}{\sin 31^{\circ}}\\\\a \approx \boxed{8.2}

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