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82 lines
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<div class="alpha"><a class="alphaLtr" href="letter-a.html">A</a><a class="alphaLtr" href="letter-b.html">B</a><a class="alphaLtr" href="letter-c.html">C</a><a class="alphaLtr" href="letter-d.html">D</a><a class="alphaLtr" href="letter-e.html">E</a><a class="alphaLtr" href="letter-f.html">F</a><a class="alphaLtr" href="letter-g.html">G</a><a class="alphaLtr" href="letter-h.html">H</a><a class="alphaLtr" href="letter-i.html">I</a><a class="alphaLtr" href="letter-j.html">J</a><a class="alphaLtr" href="letter-k.html">K</a><a class="alphaLtr" href="letter-l.html">L</a><a class="alphaLtr" href="letter-m.html">M</a><a class="alphaLtr" href="letter-n.html">N</a><a class="alphaLtr" href="letter-o.html">O</a><a class="alphaLtr" href="letter-p.html">P</a><a class="alphaLtr" href="letter-q.html">Q</a><a class="alphaLtr" href="letter-r.html">R</a><a class="alphaLtr" href="letter-s.html">S</a><a class="alphaLtr" href="letter-t.html">T</a><a class="alphaLtr" href="letter-u.html">U</a><a class="alphaLtr" href="letter-v.html">V</a><a class="alphaLtr" href="letter-w.html">W</a><a class="alphaLtr" href="letter-x.html">X</a><a class="alphaLtr" href="letter-y.html">Y</a><a class="alphaLtr" href="letter-z.html">Z</a></div></nav>
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<div itemscope itemtype="https://schema.org/ScholarlyArticle"><meta itemprop="description" content="Definition of Antiprism" /><div class="defTop"><div class="defDefOf">Definition of </div><div class="defWord"><div itemprop="name"><h1>Antiprism</h1></div></div></div>
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<p>It is like a prism, but the two ends (identical polygons) are twisted and connected by a band of alternating triangles.</p>
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<p>Here is an octagonal antiprism: there are two identical parallel octagons, one is twisted, then they are joined by triangles.</p>
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<p>The twist is usually 180°/(number of sides), so the octagonal antiprism has a twist of 180/8 = 22.5°.</p>
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<p>Below is a square antiprism, with a 180°/4 = 45° twist.</p>
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<div style="clear:both"></div><div class="defSeeWord">See: <a href="prism.html">Prism</a></div><div style="clear:both"></div>
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