Introduction to the Law of Cosines

A triangle with two sides that measure 5 cm and 8 cm with an included angle of 39°

• 15.9cm²

• 12.6cm²

• 15.3cm²

• 16.2cm²

9.Solve for a.

• 4.28

• 8.56

• 3.22

• 9.45

Find alpha

• 53.6

• 13.3

• 113.1

• 78.2

How Many Triangles would be possible?

• 2

• 1

• 0

• INFINITE

Solve for Beta

• 45.2

• 26.3

• 36.3

• 56.2

Which Law would you use to solve for Angle B?

• Law of the Jungle

• Law of Cosines

• Law of the Gravity

• Law of Sines

Use the Law of Cosines to find the value of x.  (Level 1)

• 41.7

• 51.7

• 61.7

• 71.7

Find the length of Side BC.

• 33

• 24

• 12

• 29

Find the length of side AB.

• 10

• 8

• 6.1

• 4.9

What is the measure of angle A?

• 58 degrees

• 61 degrees

• 78 degrees

• 74 degrees