can someone explain the cosine rule

  • -1 votes

i dont get it

Posted Mon 2nd April, 2012 @ 19:22 by Nathan

2 Answers

  • 2 votes
Answered Mon 2nd April, 2012 @ 19:43 by Maleficent
  • -1 votes

i dont think you need to know how you get it but know what it is and when to use it;

a^2= b^2 + c^2 -2bcCosA

when you know 1 angle and 2 lengths in a triangle

Answered Tue 3rd April, 2012 @ 10:01 by Georgina