Please help very confusing

[tex]▪▪▪▪▪▪▪▪▪▪▪▪▪ {\huge\mathfrak{Answer}}▪▪▪▪▪▪▪▪▪▪▪▪▪▪[/tex]
Here,
that is ~
cosine ratio of Z = cos Z.
cos Z = adjacent side of angle Z (base) / Hypotenuse
cos Z = 12/20 = 6/10 = 3/5.
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Hope it helps!
RainbowSalt2222 ☔