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# Alg2 lesson 13-5

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### Alg2 lesson 13-5

1. 1. SolveIs this a right triangle? NO We can’t use trig functionsCan we use the Law of Sines? NO We don’t know the measure of an angle and its opposite side
2. 2. Law of Cosines
3. 3. Solve
4. 4. Solve144 130 126 14 126
5. 5. Solve
6. 6. Use When you haveTrig functions (sin, cos, A right triangle tan, csc, sec, cot) Law of Sines An angle and its opposite side AND one other side/angle Law of Cosines Three sides or two sides and an included angle
7. 7. What would you use to begin to solve this triangle? Law of Cosines
8. 8. What would you use to begin to solve this triangle?Law of Cosines
9. 9. What would you use to begin to solve this triangle?Law of Sines
10. 10. What would you use to begin to solve this triangle? Trig functions (sin or cos)