Law of cosines

Example: a = 6,8 cm, b = 5,3 cm, C= 57o. Calculate c.

 

Area of a triangle:

 

Exercises:

1.- Two of the sides of a triangle measure 3 and 5 cm, respectively, and they form an angle of 40o. Calculate the other side.

2.- The sides of a triangle measure 3, 5 and 6 metres, respectively. Calculate the three angles.

 

 

Solutions: 1) a = 3.3 cm; 2) A = 29.9o, B = 56.3o and C = 93.8o.

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