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cba = 70
acb = 75
ace = 35
BCA = 180 - 70 - 35 = 75 ( saling pelurus jumlah sudut harus 180)
CBA = DCE = 70 ( sudut sehadap, besar sudutnya sama besar)
FBA = 180 - 70 = 110 ( saling pellurus, jumlah sudutnya 180)