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# Glossary

Glossary

• Cylinder

A three-dimensional geometric figure with parallel congruent bases. The bases can be shaped like any closed plane figure (not necessarily a circle) and must be oriented identically.

• Torus

A doughnut shape. Formally, a torus is a surface of revolution obtained by revolving (in three dimensional space) a circle about a line which does not intersect the circle.

• Pyramid

A polyhedron with a polygonal base and lateral faces that taper to an apex.

• Sphere

A three dimensional solid consisting of all points equidistant from a given point. This point is the centre of the sphere.

• Prism

A solid with parallel congruent bases which are both polygons. The bases must be oriented identically. The lateral faces of a prism are all parallelograms or rectangles.

• Cone

A three dimensional figure with a single base tapering to an apex. The base can be any simple closed curve.

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