HEPTAGON i know it sounds wierd but that's what its called.
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A shape with four sides and three vertices does not exist in Euclidean geometry. In Euclidean geometry, a shape must have the same number of sides as vertices. Therefore, a shape with four sides would have four vertices.
A 2-dimensional shape is a 'DECAGON'. A 3-dimensional shape is a 'DECAHEDRON'.
It means 7 as in an heptagon which has 7 sides
A heptagon has 7 sides.
7 sides heptagon 9 sides nonagon