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XSIQ * Geometry - Spheres, hemispheres and toruses Spheres, hemispheres and toruses Most balls (except for footballs) are spheres. [1] They are based on circles. A hemisphere [2] is half a sphere. Tyre and donut shapes are examples of a torus. [3] Previous | Next Links: ------ [1] http://alison.com/# [2] http://alison.com/# [3] http://alison.com/#
