Cosine and Sine Rule

Which rule could you use to find the side opposite angle B? 

• cosine rule
• sine rule
• both sine rule and cosine rule
• Pythagorean theorem

Which could you use to find another angle of the triangle? 

• Cosine rule
• Sine rule
• Pythagorean theorem
• both sine rule and cosine rule

Which rule could you use to find angle K? 

• cosine rule
• sine rule
• both sine rule and cosine rule
• Pythagorean theorem

Which rule would you use to find angle Q?

• sine rule
• cosine rule
• Neither sine rule nor cosine rule
• Pythagorean theorem

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

Find the length of side b of the triangle with A = 48⁰ ,
a = 11 m,  B = 56^o

• 12 m
• 13 m
• 14 m
• 15 m

Triangle ABC has side a = 3, side b = 5, and side c = 7. Find the size of angle A. 

• 22⁰
• 38⁰
• 120⁰
• 150⁰

Find the size of angle A?

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

Find the length of side AC

• 12
• 10
• 23
• 14