a 5-sided shape is called a pentagon.
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a solid figure with five plane surfaces
A pyramid is a three-dimensional figure with five verticies and five sides (four of which are triangles and one of which is a square). A pentagon is a two-dimensional figure with five angles and five edges.
A five sided geometric shape is called a pentagon.
penyi sisido penyi sisido
You'd probably call a 2-d figure like this a "108-gon"