Law of Cosines Formula

What is the measure of angle A?

• 50 degrees

• 60 degrees

• 78 degrees

• 74 degrees

Solve the Triangle
a=38, b= 31, c= 35
Find A, B and C

• A= 43°, B= 47°, C= 90°

• A= 70°, B= 50.1°, C= 59.9°

• A= 50.1°, B= 70°, C= 59.9°

• A= 60°, B= 70°, C= 50°

Rearrange the Law of Cosines formula to solve for angle B.

• 
• 
• 

• A
• B
• C
• D

Find QR

• 34.7 km

• 35.7 km

• 36.7 km

• 33.7 km

Find m<B

• A

• B

• C

• D

Find m<C

• A

• B

• C

• D

Find QR

• 34.7 km

• 2.2 km

• 13.74

• 31.1 km

Use the angle formula from the Law of Cosines to find m<C.

• A

• B

• C

• D

Use Law of Cosines to find QR.

• 34.7 km

• 2.2 km

• 13.74

• 31.1 km