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Alg2 lesson 13-5
1. Solve
Is this a right triangle?
NO
We can’t use trig functions
Can we use the Law of Sines?
NO
We don’t know the measure
of an angle and its opposite
side
7. Use When you have
Trig 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
8. What would you use to begin to solve this triangle?
Law of Cosines
9. What would you use to begin to solve this triangle?
Law of Cosines
10. What would you use to begin to solve this triangle?
Law of Sines
11. What would you use to begin to solve this triangle?
Trig functions
(sin or cos)