Smart, Edward Howard · London : Macmillian and Co. · leaf 99
Fig. 346. § 13. Prop. The angular points of the diagonal triangle ofa quadrilateral circumscribed to a circle coincide with the dia-gonal points of the quadrangle, formed by the points of contact. F … For (Fig. 35) the polar of A passes through E ; .. the polarof E passes through A. 72 PROJECTIVE GEOMETRY Similarly it passes through C; .. it is AC. But the polar of E is FG, F and G being the other twodiagonal points of the inscribed quadrangle. .. one side of the diagonal triangle of the…
Geometry, Projective
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