a hexagon
* * * * *
or any one of infinitely many polygons with 5 or more sides; any one of an infinite number of polyhedra with more than 4 faces, as well as other shapes that do not fit into these classifications: for example, a closed plane shape with five curved sides which meet pairwise.
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2 sides, 2 corners. (:
There is no such shape. If it has two sides meeting, it also has to have a corner. A triangle has three sides and three corners, and a square has four sides and four corners. There is nothing in between.
a pentagon
Hexagon
That would be a square :D