Law of Sines, Cosines, and Area of Triangles

What rule should you use?

• Sine
• Cosine

What rule should you use?

• Sine
• Cosine

• 10.1
• 10.0
• 10.9
• 8.86

What is the measure of angle A?

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

When using the sine rule how many parts (fractions) do you need to equate?

• All 3 parts
• 1 part
• 2 parts

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

We can use SOH-CAH-TOA for...

• Any triangle ever
• Non-right triangles only
• Right Triangles only
• Never

Find the missing side x

• 60.5mm

• 10.3mm

• 30.1mm

• 58.1mm

Find the area of the triangle

• 72.3cm²

• 84.4cm²

• 77.9cm²

• 78cm²

If the sides of a triangle are 8, 8, and 8, what is the area?

• 8

• 15.58

• 27.71

• 62.91