a cone with the line from the vertex to the centre of the base perpendicular to the base.
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EXAMPLES
Here are some examples of the kinds of definitions you’ll find on this page.
Subject:
(also called a rectangular prism) a 3D form in which all the faces are rectangular.
Subject:
a pyramid with its vertex directly above the centre of its square base.
Subject:
an infection of the skin, caused by a parasitic mould. It causes small, red itchy circles on the...