Penjelasan dengan langkah-langkah:
∠BCD = 180-90-78 = 12°
∠BCE = 12÷2 = 6°
∠CED = 180-6-78 = 96°
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Penjelasan dengan langkah-langkah:
∠BCD = 180-90-78 = 12°
∠BCE = 12÷2 = 6°
∠CED = 180-6-78 = 96°