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Besar ∠BCA = ?
∠BCA = ∠ABC ----------- karena menghadap sisi yang sama besar (AB = AC)
Jumlah sudut dalam segitiga = 180°
Sehingga,
∠BCA = ------- dibagi 2 karena ∠BCA = ∠ABC
∠BCA = 55°
Semoga membantu :)