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BEC 110°
Bertolak belakang = DEA bertolak belakang dgn BEC, DEC bertolak belakang dgn AEB.
smg membantu
DEC = 180 - 110
DEC = 70
B . BEC = 180 (karena pelurus) - DEC
= 180 - 70 (jawaban soal A)
= 110
C . AED bertolak belakang dengan BEC
DEC bertolak belakang dengan AEB