1. 7.2 Law of Cosines Day 1 Thurs Feb 12 Do Now Find the area of the triangle ABC given A = 113deg, b = 18.2 cm, c = 23.7 cm

2. p.608 #17-31 odds

3. Law of Cosines In any triangle ABC, When the angle in between is a right angle, the law of cosines reduces to the Pythagorean Theorem

4. Ex1 Solve triangle ABC if a = 32, c = 48, B = 125.2 degrees

5. Ex2 P.614 ex2

6. Ex3 Solve triangle RST if r = 3.5, s = 4.7, t = 2.8

7. Ex4 P.616 ex4

8. Closure When would we choose the law of sines or law of cosines when solving a triangle? HW: p.618 #1-15 odds 25 27 29

9. 7.2 Law of Cosines Day 2 Tues Feb 17 Do Now Solve the triangle ABC, if possible B = 133 degrees, a = 12, c = 15

10. HW Review: p.618 #1-15 25-29

11. When to use Law of Sines/Cosines Given the following sides/angles, SituationLaw to Use SSSLaw of Cosines ASALaw of Sines AASLaw of Sines SASLaw of Cosines SSALaw of Sines AAAneither

12. Closure Determine which law applies, then solve the triangle ABC given a = 15, c = 7, B = 62 degrees HW: p.619 #17-23 odds, 31-35 odds