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



                C


        b
                    a


    A                   B
            c
•
•
•
•
• Section 7.7
• Page 388
  • 11 – 18


• Study Guide and Review
• Page 393
  • 9, 10, 14, 17, 19, 23, 24, 25, 27, 30
• How can I solve non-right triangles using the Law of
  Sines and Law of Cosines?
• 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)
• 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°
•
• Page 388
  • 19 – 25
  • 41 and 42


• Fill in Chapter 7 Example chart
• 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

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Geometry/Notes 7.7

  • 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