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What rule should you use?

• Sine
• Cosine

What is the measure of angle A?

• 50 degrees
• 60 degrees
• 78 degrees
• 74 degrees

Which of the following formulas is the Cosine rule?

• c² = a² + b² - 4ac + cosA
• c² = a² - b² - 2abcosC
• c² = a² + b² - 2abcosC
• (cos A)/a = (cos B)/b

Which rule can be used directly for this triangle?

• The Sine Rule
• The Cosine Rule
• The Area of a Triangle
• Pythagoras' Theorem

What is the length of side x?

• 130 cm
• 112 cm
• 150 cm
• 105 cm

Find AC

• 12
• 10
• 23
• 14

Find AB

• 10
• 8
• 6.1
• 4.9

Find angle A

• 53.6
• 13.3
• 113.1

Use the Law of Cosines to find the value of x. 

• 41.7
• 51.7
• 61.7
• 71.7

Find the unknown length. (3 s.f.)

• 12.7m

• 13.5m

• 14.8m

• 11.7m