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In geometry, a pentagon (from pente, which is Greek for the amount 5) is any type of five-sided polygon. A pentagon might be simple or self-intersecting. The total of the internal angles in a simple pentagon is 540 °. A pentagram is an example of a self-intersecting pentagon. In a normal pentagon, all sides are equal in size and also each interior angle is 108 °. A frequent pentagon has 5 lines of reflectional balance, as well as rotational symmetry of order 5 (via 72 °, 144 °, 216 ° and 288 °). Its Schläfli sign is . The diagonals of a normal pentagon are in fantastic proportion to its sides. A pentagram or pentangle is a frequent star pentagon. Its Schläfli sign is 5. Its edges form the diagonals of a routine convex pentagon-- in this plan the sides of the 2 pentagons are in the fantastic percentage.

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