パスカルの定てい理りMeanings1nounPascal's theoremA theorem in projective geometry stating that if a hexagon is inscribed in a conic, the three intersection points of opposite sides are collinear.パスカルの定てい理りは射しゃ影えい幾き何か学がくの基き本ほん的てきな定てい理りの一ひとつです。Pascal's theorem is one of the fundamental theorems of projective geometry.