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∠BAC=30°
∠BAD=90°(sudut menghadap diameter lingkaran selalu siku-siku)
∠AED=∠BAD-∠BAC=90°-30°
=60°
Karena ∠AED dan ∠BEC saling bertolak belakang, maka besar kedua sudut tersebut sama. Jadi, besar ∠BEC=60°