Law of Cosines

True or False: Law of Cosines can only be used to find side lengths

• true

• false

Tags

CCSS.HSG.SRT.D.10

CCSS.HSG.SRT.D.11

True or False: Law of Cosines can be used to find angles for triangles when you are given the three sides.

• true

• false

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

How would you solve this?

DO NOT ACTUALLY SOLVE

• Law of Sine

• Law of Cosine

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CCSS.HSG.SRT.D.10

CCSS.HSG.SRT.D.11

Use Law of Cosines to find angle T

• 62.2°

• 53.1°

• 59.5°

• 64.7°

Tags

CCSS.HSG.SRT.D.10

CCSS.HSG.SRT.D.11

Find XZ

• 16.004 meters
• 544.165 meters
• 34.7 meters
• 1204.165 meters

Tags

CCSS.HSG.SRT.D.10

CCSS.HSG.SRT.D.11

Which Law would you use?

• Law of Sines
• Law of Cosines
• Law of the Jungle
• Law of Gravity

Tags

CCSS.HSG.SRT.D.10

CCSS.HSG.SRT.D.11

Which Law would you use?

• Law of Sines
• Law of Cosines
• Law of the Jungle
• Law of Gravity

Tags

CCSS.HSG.SRT.D.10

CCSS.HSG.SRT.D.11

Find angle Z

• 18.77°

• 71.23°

• 51.06°

• 57.71°

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CCSS.HSG.SRT.D.10

CCSS.HSG.SRT.D.11

What is the length of side x? Use Law of Cosines

• 130 cm

• 112 cm

• 150 cm

• 105 cm

Tags

CCSS.HSG.SRT.D.11

CCSS.HSG.SRT.D.10