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五角形の内角の和より
∠x+108°+124°+●●+✕✕=540°
∠x+●●+✕✕=308°⋯①
三角形の内角の和より
86°+●+✕=180°
●+✕=94°
●●+✕✕=188°⋯②
①に②を代入すると、
∠x+188°=308°
∠x=120°
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