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There is no 3-d shape with 3 plane sides. With curved sides, there are a very large nuber of shapes: some of these are a cylinder, or a cylinder with hemispheric ends (like a medicine capsule), a double cone, a conic fustrum.
A 3d shape can have infinite sides
sides are the face of a 3d shape and verticies are the corner of the shape
A septadecahedron has 17 sides to it.
No 3D shape has only three sides to be a complete unit. If a 3D shape has a side which is curved, it has more than three sides, because any curve on a 3D object is an infinite number of sides. Think of it like if you had a million sided 2D object. From a distance, it would look like a circle, but mathematically, you can't have a perfect circle.
2D shape = Decagon 3D shape = Decahedron