✨ Best Answer ✨
△ECD
180°-a=●+×
△BCD
180°=x+2(●+×)
180°=x+2(180°-a)
180°=x+360°-2a
x=2a-180°
✨ Best Answer ✨
△ECD
180°-a=●+×
△BCD
180°=x+2(●+×)
180°=x+2(180°-a)
180°=x+360°-2a
x=2a-180°
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