+0  
 
0
171
1
avatar

1. In triangle ABC we have AB=6 BC=12 AC=7 find cos angle A

 Sep 29, 2021
 #1
avatar+36417 
+2

Law of cosines

7^2 + 6^2 - 2(7)(6)cos a  = 12^2      solve for cos a

 Sep 29, 2021

29 Online Users