The cross section of a sphere is most often a circle. When the cross section is taken parallel to the base of a cylinder, it is also a circle.
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polygons have faces and cylinders and cone and spheres only has bases not faces.
They are not the same!
They both have a circular face.
A few object types are cubes, spheres, and cylinders.
Spheres and cylinders are studied in geometry. In fact there is a geometry that just deals with spheres called spherical geometry. Imagine living on a sphere ( you almost do) compared to living on a plane. Some geometric postulates must be modified for this.There is a geometry of living on the surface of a cylinder too.