![]() Shapes have a wide application in real-life applications. Understanding shapes is important in geometry. A Decagon has 10 sides, just like a Decimal point has 10 digits.The terms Nonagon and Nine both start with the letter N.The Washington DC in the US has 5 sides (Pentagon). ![]() A QuadBike has 4 wheels and thus a quadrilateral.The following are a few mnemonics to help remember the names of some polygons: A concave polygon can have at least four sides-the vertex points towards the inside of the polygon. ![]() If one or more interior angles of a polygon are more than 180 degrees, it is known as a concave polygon. The vertex of a convex polygon always points outwards from the center of the shape. This is a type of polygon with all the interior angles strictly less than 180 degrees.
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