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∠CQD=180°-(∠DCA+∠CDQ)で求められる。
四角形ABCDが平行四辺形より∠ADC=∠ABC=60°
よって∠CDQ=(60-a)°
したがって∠CQD=180°-{75°+(60-a)°}
∠CQD=(45+a)°

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