segitiga KLM memiliki koordinat K (-5,-2), L (3,-2), dan M (-5,4) nilai cos L adalah...

LM = √KL^2 + KM^2
LM = √8^2 + 6^2
LM = √64 + 36
LM = √100
LM = 10

cos = samping/miring
cos L = 8/10
= 4/5