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한 직선에 수직인 두 평면은 서로 평행하다.(Two planes perpendicular to a straight line are parallel to each other.)

Auteur:민은기 (Min Eun Gi)
한 직선에 수직인 두 평면은 서로 평행하다.(Two planes perpendicular to a straight line are parallel to each other.) https://min7014.github.io/math20230319001.html

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