Heptadecagonal

Heptadecagonal refers to something having seventeen sides. It is most commonly used in the context of geometry, specifically to describe a polygon with seventeen sides. A heptadecagonal polygon is a closed two-dimensional shape with straight sides, where each side is of equal length and each interior angle is equal. In such a regular heptadecagonal polygon, there are seventeen vertices and seventeen edges. The term can also apply to other geometric shapes or structures that exhibit seventeen-sided symmetry or composition. For instance, a heptadecagonal prism would have two heptadecagonal bases and seventeen rectangular faces connecting them. The heptadecagon is notable in mathematics due to its constructibility with ruler and compass, a property first proven by Carl Friedrich Gauss. This means it is possible to construct a regular heptadecagon using only an unmarked ruler and a compass. The number seventeen has specific mathematical significance in this regard, placing it within a special class of polygons.