Sine Cosine 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

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

• Any triangle ever

• Non-right triangles only

• Right Triangles only

• Never

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 could you use to find side p? 

• sine rule

• cosine rule

• both sine rule and cosine rule

• Pythagorean theorem

Draw the following triangle and label the sides (a,b,c) and their corresponding opposite angles (A,B,C). 
A = 58⁰, B = 76⁰  and  c = 8, use the Sine rule to find the length of side a.  

• 9

• 8

• 7

• 6

Which Law would you use?

• Sine rule

• Cosine rule

Use the Cosine rule to find the size of angle x. 

• 41.7

• 51.7

• 61.7

• 71.7

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 rule would you use to find angle Q?

• sine rule

• cosine rule

• Neither sine rule nor cosine rule

• Pythagorean theorem