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仮定より∠BAD=∠BCD=90°...①
∠DAC=∠DCA...②
共通な辺なのでBD=BD...③
②より、△DACは二等辺三角形なので(?)AD=CD...④
①③④より、直角三角形の斜辺と他の1辺が等しいので

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