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Reference.org
Pappus configuration
open-in-new
<p>In <a href="/facts/Geometry/wTQf5ffQ">geometry</a>, the Pappus configuration is a <a href="/facts/Configuration_(geometry)/2EJN52Ud">configuration</a> of nine points and nine lines in the <a href="/facts/Euclidean_plane/tAUtRFcn">Euclidean plane</a>, with three points per line and three lines through each point. </p>