1. Law of Cosines

2. • How can I apply the Law of Cosines?

3. •
C
b
a
A B
c

4. •

5. •

6. •

7. •

8. • Section 7.7
• Page 388
• 11 – 18
• Study Guide and Review
• Page 393
• 9, 10, 14, 17, 19, 23, 24, 25, 27, 30

9. • How can I solve non-right triangles using the Law of
Sines and Law of Cosines?

10. • Used in 2 cases:
• Know 2 angles and any side (AAS or ASA)
• Know 2 sides and an angle opposite one of the sides (SSA)

11. • Used in 2 cases:
• Know all three sides (SSS)
• Know two sides and the included angle (SAS)
• *Don’t forget the sum of angles is 180°

12. •

13. • Page 388
• 19 – 25
• 41 and 42
• Fill in Chapter 7 Example chart

14. • Intro
• Previously we did the Law of Sines, today is the Law of Cosines.
• Standards-
• Supplies – slides, whiteboard, Timing - 2 days. The second day is
figuring out which law to utilize.
• Day 1
• Essential Questions- slide 2
• Input – slides 3 and 4
• Guided Practice – slides 5 and 6
• Independent Practice – Bookwork
• Day 2
• Essential Question - 9
• Input – slide 10 & 11
• Guided Practice – slide 12
• Independent Practice - Bookwork