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cos k = sa/mi = 1/a
jadi sisi samping sudut memiliki pnjang 1 dan sisi miring sudut memiliki pnjang a
a²= KL² + LM²
a²=1² + LM²
LM²=a²-1
LM=
sin K = de/mi
=/a
tan K = de/sa
=/1
sin K x tan K
.
(a²-1)/a