Introduction to the Law of Cosines

Use Law of Cosines to find angle T

• 62.2°

• 53.1°

• 59.5°

• 64.7°

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

• Cosines

• Sines

• Tangent

• Cosecents

Find XZ

• 16.004 meters

• 544.165 meters

• 34.7 meters

• 1204.165 meters

Find QR

• 34.7 km

• 2.2 km

• 13.74

• 31.1 km

Solve for x by using the Law of Cosines

• 3.85

• 4.25

• 3.35

• 5.65

Which Law would you use?

• Law of Sines

• Law of Cosines

• Law of the Jungle

• Law of Gravity

Which Law would you use to solve for side AC?

• Law of Sines

• Law of Cosines

• Newton's Laws

• SOHCAHTOA

The diagram shows a lake. Which formula would you use to determine the distance across the lake?

• Law of Sines

• Law of Cosines

Which Law would you use?

• Law of Sines

• Law of Cosines

• Law of the Jungle

• Law of Gravity

Which Law would you use?

• Law of Sines

• Law of Cosines

• Law of the Jungle

• Law of Gravity