Law of Sines and Cosines Review

Find angle Z

• 20.15°

• 71.23°

• 51.06°

• 57.71°

Find BC

• A
• B
• C
• D

Choose which law you need to solve the problem (DO NOT SOLVE):

• Law of Sines

• Law of Cosines

• Both

• Neither

Find the area to the nearest tenth

Find AB

• 10
• 8
• 6.1
• 4.9

What is the measure of angle A?

Solve the Triangle(s): A = 26^o, a = 5, b = 9

• no triangle possible

• B = 14^o, C = 21^o, c = 8.7

• B = 52^o, C = 102^o, c = 11.2

• B = 52^o , C = 102^o, c = 11.2

  OR

  B = 128^o, C = 26^o, c = 5.0

Which of the following formulas shows the Law of Cosines?

• c² = a² + b² - 4ac + cosA
• c² = a² - b² - 2abcosC
• c² = a² + b² - 2abcosC
• (cos A)/a = (cos B)/b

Which law would you use?

• Law of Sines

• Law of Cosines

Which law would you use?

• Law of Sines

• Law of Cosines