Law of Cosines

1. Consider triangle ABC, where angle A measures 58.1^o, side b measures 400 cm and side c measures 500 cm.  What is the measure of side a? 

 a =  445.7 cm

a  =  446 cm

 a   = 445 cm

2. Consider triangle ABC, where side a measures 7.0 m, side b measures 10 m and side c measures 13 m.  What is the measure of angle B? 


  Angle B is 49^o

  Angle B is 49.6^o

  Angle B is 50^o

3. A triangular lot measures 14m on on side (call that side a), 17m on a second side (call that side b) and 25m on a third side (called c).   What is the measure of angle A.

  Angle A is 32^o

  Angle A is 32.4^o

  Angle A is 33^o