" Life is not a problem to be solved but a reality to be experienced! "
© Copyright 2013 - 2024 KUDO.TIPS - All rights reserved.
13 = √5² + 12² + 2(5)(12) cosα
169 = 169 + 120 cosα
0 = 120 cosα
0/120 = cosα
0 = cosα
α = 90°(E)