Geometric configuration of 9 points and 9 lines

Pappus configuration

Pappus configuration

In <a href="/en/Geometry" title="Geometry" class="wl">geometry</a>, the Pappus configuration is a <a href="/en/Configuration_(geometry)" title="Configuration (geometry)" class="wl">configuration</a> of nine points and nine lines in the <a href="/en/Euclidean_plane" title="Euclidean plane" class="wl">Euclidean plane</a>, with three points per line and three lines through each point.<a href="#cite_note-1" style="counter-reset: mw-Ref 1;">[1]</a>

<div class="shortdescription nomobile noexcerpt noprint searchaux" style="display:none" about="#mwt1">Geometric configuration of 9 points and 9 lines</div>
<figure class="mw-default-size wiki-thumb"><a href="/en/File:Pappusconfig.svg" class="mw-file-description image media-thumb" data-hash="File:Pappusconfig.svg"><img loading="lazy" src="//upload.wikimedia.org/wikipedia/commons/thumb/d/d4/Pappusconfig.svg/220px-Pappusconfig.svg.png" decoding="async" data-file-width="500" data-file-height="500" data-file-type="drawing" height="220" width="220" srcset="//upload.wikimedia.org/wikipedia/commons/thumb/d/d4/Pappusconfig.svg/330px-Pappusconfig.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/d/d4/Pappusconfig.svg/440px-Pappusconfig.svg.png 2x" alt="Pappusconfig.svg"></a><figcaption>Pappus configuration</figcaption></figure>

In geometry, the Pappus configuration is a configuration of nine points and nine lines in the Euclidean plane, with three points per line and three lines through each point. 