Law of Sine and Cosine

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

• 41.7

• 51.7

• 61.7

• 71.7

Which of the following formulas shows the Law of Cosines?

• c² = a² + b² - 4ac + cosA

• c² = a² - b² - 2abcosC

• c² = a² + b² - 2abcosC

• (cos A)/a = (cos B)/b

Which Law would you use to solve for Angle B?

• Law of the Jungle

• Law of Cosines

• Law of the Gravity

• Law of Sines

Find AB

• 10

• 8

• 6.1

• 4.9

Which rule can be used directly for this triangle?

• The Sine Rule

• The Cosine Rule

• The Area of a Triangle

• Pythagoras' Theorem

Solve for x. Round to the nearest tenth.

• 9.8

• 0.1

• 0.038

• 9.9

Find the trig value.

• A

• B

• C

• D

What rule should you use?

• Sine

• Cosine

Find the cos B

• 3/5

• 3/4

• 4/5

• 5/4

Find the sin C

• 3/5

• 3/4

• 4/5

• 5/3

• 5/4