Law of Cosines

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

Tags

CCSS.HSG.SRT.D.10

CCSS.HSG.SRT.D.11

What are the possible criteria for the Law of Cosines?

• SSA, SSS

• SSA, ASA

• SSS, SAS

• AAS, ASA

Tags

CCSS.HSG.SRT.D.10

CCSS.HSG.SRT.D.11

Which law would you use?

• Law of Sines

• Law of Cosines

Tags

CCSS.HSG.SRT.D.10

CCSS.HSG.SRT.D.11

Which law would you use?

• Law of Sines

• Law of Cosines

Tags

CCSS.HSG.SRT.D.10

CCSS.HSG.SRT.D.11

 $m\angle H=$  

•  $44.1\degree$  

•  $44.6\degree$  

•  $45.2$  

•  $45.6\degree$  

Tags

CCSS.HSG.SRT.D.10

CCSS.HSG.SRT.D.11

 $m=$  

• 12.7

• 13.1

• 13.6

• 14.2

Tags

CCSS.HSG.SRT.D.10

CCSS.HSG.SRT.D.11

Which law would you use?

• Law of Sines

• Law of Cosines

Tags

CCSS.HSG.SRT.D.10

CCSS.HSG.SRT.D.11

Which Law would you use?

• Law of Sines

• Law of Cosines

Tags

CCSS.HSG.SRT.D.10

CCSS.HSG.SRT.D.11

Solve for "B" if:

a = 4, b = 5, and c = 8.

• 47.5^o

• 125.1^o

• 30.8^o

• 24.1^o

Tags

CCSS.HSG.SRT.D.10

CCSS.HSG.SRT.D.11

 $m\angle G=$  

•  $74.3\degree$  

•  $76.1\degree$  

•  $76.9\degree$  

•  $77.5\degree$  

Tags

CCSS.HSG.SRT.D.10

CCSS.HSG.SRT.D.11