bagaimana menentukan rumus trigonometri sin cos tan sec csc ctg ??

sin = depan/miring. => a/c
cos = samping/miring. => b/c
tan = depan/samping => a/b
cosec = miring/depan. => c/a
sec = miring/samping. => c/b
cot= samping/depan. => b/a