Non Right Triangles

What is the length of side x?

• 130 cm

• 112 cm

• 150 cm

• 105 cm

Find the length of AB

• 10

• 8

• 6.1

• 4.9

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 could you use to find angle K? 

• cosine rule

• sine 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, using your diagram decide which rule to use and find the size of angle C.

• 136⁰

• 96⁰

• 50⁰

• 46⁰

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

• 22⁰

• 38⁰

• 120⁰

• 150⁰

Which Law would you use?

• Sine rule

• Cosine rule

Find the size of angle A?

• 50 degrees

• 60 degrees

• 78 degrees

• 74 degrees

Find the size of angle A

• 53.6

• 13.3

• 113.1