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In geometry, a nonagon (or enneagon) is a nine-sided polygon. The name "nonagon" is a hybrid formation, from Latin (nonus, "ninth" + gonon), used equivalently, attested already in the 16th century in French nonogone and in English from the 17th century. The name "enneagon" comes from Greek enneagonon, (εννεα, nine + γωνον (from γωνία = corner)), and is arguably more correct, though somewhat less common. A regular nonagon has internal angles of 140°. The area of a regular nonagon of side length a is given by

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  • Nonagon
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  • In geometry, a nonagon (or enneagon) is a nine-sided polygon. The name "nonagon" is a hybrid formation, from Latin (nonus, "ninth" + gonon), used equivalently, attested already in the 16th century in French nonogone and in English from the 17th century. The name "enneagon" comes from Greek enneagonon, (εννεα, nine + γωνον (from γωνία = corner)), and is arguably more correct, though somewhat less common. A regular nonagon has internal angles of 140°. The area of a regular nonagon of side length a is given by
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dbkwik:math/proper...iPageUsesTemplate
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  • Nonagon
Title
  • Nonagon
abstract
  • In geometry, a nonagon (or enneagon) is a nine-sided polygon. The name "nonagon" is a hybrid formation, from Latin (nonus, "ninth" + gonon), used equivalently, attested already in the 16th century in French nonogone and in English from the 17th century. The name "enneagon" comes from Greek enneagonon, (εννεα, nine + γωνον (from γωνία = corner)), and is arguably more correct, though somewhat less common. A regular nonagon has internal angles of 140°. The area of a regular nonagon of side length a is given by Although a regular nonagon is not constructible with compass and straightedge there are methods of constructing that are very close approximations.
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