Question

WILL GIVE BRAINLIST SOON AS I CAN what numbers will I be using here? I don't really know what I'm doing.

Answer 1

C^2= 20^2+15^2-2(20)(15)cos50
C^2=400+225-600(.643)
C^2=625-385.673
C^2=214.327
C= 14.639
C=14.6