Law of Cosines Introduction

Find angle Z

• 20.15°

• 71.23°

• 51.06°

• 57.71°

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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°

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CCSS.HSG.SRT.D.10

CCSS.HSG.SRT.D.11

If three sides of a triangle are given, the Law of ____ is used to solve the triangle.

• Cosines

• Sines

• Tangent

• Cosecents

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CCSS.HSG.SRT.D.10

CCSS.HSG.SRT.D.11

Find QR

• 34.7 km

• 2.2 km

• 13.74

• 31.1 km

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CCSS.HSG.SRT.D.11

Which Law would you use?

• Law of Sines

• Law of Cosines

• Law of the Jungle

• Law of Gravity

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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

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CCSS.HSG.SRT.D.10

CCSS.HSG.SRT.D.11

Which Law would you use to solve for side AC?

• Law of Sines

• Law of Cosines

• Newton's Laws

• SOHCAHTOA

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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

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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

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CCSS.HSG.SRT.D.10

CCSS.HSG.SRT.D.11

Solve for x by using the Law of Cosines

• 3.85

• 4.25

• 3.35

• 5.65

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CCSS.HSG.SRT.D.10

CCSS.HSG.SRT.D.11