**Know these formulas and how to use them:**

**Example problems:**

1. If a = 20, b = 13, A = 73 degrees, find B.

2. If a = 12, b = 15, C = 60 degrees, find c.

3. If a = 12, b = 15, and C = 60 degrees, find the area of triangle ABC.

**Answers:**

1. 38.4 degrees

2. 13.7

3. 77.9 square units

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