High Quality Content by WIKIPEDIA articles! In geometry, a pentagon is any five-sided polygon. A pentagon may be simple or self-intersecting. The internal angles in a simple pentagon total 540°. A pentagram is an example of a self-intersecting pentagon. The term pentagonal is commonly used to mean a regular convex pentagon, where all sides are equal and all interior angles are equal (to 108°). Its Schlafli symbol is {5}. The chords of this pentagon are in golden ratio to its sides.

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