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한 평면에 수직인 두 직선은 서로 평행하다.(Two straight lines perpendicular to a plane are parallel to each other.)

Auteur:민은기 (Min Eun Gi)
한 평면에 수직인 두 직선은 서로 평행하다.(Two straight lines perpendicular to a plane are parallel to each other.) https://min7014.github.io/math20230319001.html

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