High Quality Content by WIKIPEDIA articles!In algebra, a nested radical is a radical expression that contains another radical expression.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.A regular pentagon has all sides of equal length and all interior angles are equal measure (108°). It has five lines of reflectional symmetry and it has rotational symmetry of order 5 (through 72°, 144°, 216° and 288°). Its Schlafli symbol is {5}. The chords of a regular pentagon are in golden ratio to its sides.

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