0th-10th Dimensions Wiki

Calendar of April 12th, day of creation in the 0th - 10th dimensions website.

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The Concave Pentagon in the 0th - 10th Dimensions Website

The Concave Pentagon is the November Polygon of the Month for 2018.

The Concave Pentagon as a Polygon

The comcave pentagon is a polygon that has 5 sides and has at least one reflex angle.