6.6 Law of Cosines

6.6 Law of Cosines

Yesterday....

we looked at the Law of Sines. This allowed us to find the measures of missing parts of a triangle if we knew the measures of two angles and one side (either AAS or ASA)

Today....

we will look at the slightly more intimidating looking Law of Cosines.

Multiple Choice

8.Solve for x

• 3.85

• 4.25

• 3.35

• 5.65

Multiple Choice

Find the missing side.

• 15.9 in.

• 22.8 in.

• 19.2 in.

• 521.1 in.

Multiple Choice

Find QR

• 34.7 km
• 2.2 km
• 13.74
• 31.1 km

Multiple Choice

Find XZ

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

Multiple Choice

Find m<C

• A
• B
• C
• D

Multiple Choice

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

• Cosines
• Sines
• Tangent
• Cosecents

Multiple Choice

Use Law of Cosines to find angle T

• 62.2°

• 53.1°

• 59.5°

• 64.7°

Multiple Choice

Find angle Z

• 20.15°

• 71.23°

• 51.06°

• 57.71°