A sphere that surrounds another object; in geometry, the sphere that passes through all vertices of a polyhedron.
From circum- (around) and sphere (from Greek sphaira, ball). A mathematical term parallel to circumcircle in 2D geometry.
Every regular polyhedron has a circumsphere—including the tetrahedron, cube, and dodecahedron—and finding the radius of this sphere is a classic geometry problem that appears in everything from crystal structure to engineering.
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