A nine-sided polygon is called a nonagon. The prefix "non" is derived from the Latin "nonus," which means "ninth" to allude to the nine sides and angles of the polygon.
Another less common name for the nonagon is "enneagon." The name is derived from the Greek word "enneagonon," where "ennea" means "nine," and "gonon" means "corner." Thus, "enneagonon" means "nine corners," which is an accurate description of this polygon. Nonagons can be divided into regular and irregular nonagons. A regular nonagon has nine equal sides and nine equal internal angles of 140 degrees. An irregular nonagon has at least one side either longer or shorter than the rest.
Learn MoreTo calculate the circumference of a circle, multiply the diameter of the circle in question by pi. You need to know the diameter of the circle to complete this task.
Full Answer >A hexagonal prism always has 18 edges. There are six edges around the top and bottom hexagon faces, equaling 12 edges, and another six where the faces are connected on the sides, for a total of 18 edges.
Full Answer >A rectangle is a four-sided plane figure, or any quadrilateral, with four right angles. Opposite sides of a rectangle are parallel and equal in length.
Full Answer >A two-dimensional shape with nine straight sides is called a nonagon. This nine-sided polygon, which also has nine edges or vertices, is also called an enneagon. The term enneagon is preferable, but less popular than the name nonagon because the latter is simpler to spell and pronounce.
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