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小さい三角形の内角の和より
∠x+●+✕=180°⋯①
大きい三角形の内角の和より
72°+●●+✕✕=180°
●●+✕✕=108°
●+✕=54°⋯②
①に②を代入すると、
∠x+54°=180°
∠x=126°
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