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A Three Dimensional Analogue of Pappus's Theorem
Published online by Cambridge University Press: 20 November 2018
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If P, Q, R are any three points on a line a and p, q, r are any three lines that pass through a point O and lie in a plane n. which meets the line a in a point A distinct from O, then the three lines l = Qr ⋅ Rq, m = Rp ⋅ P r, n = P q ⋅ Qp lie in a plane (through O).
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- Copyright © Canadian Mathematical Society 1968