A solid figure produced when two parallel planes cut a larger solid or when one plane parallel to the base cuts it.
A frustum of a right‐circular cone is the part between two parallel planes perpendicular to the axis. Suppose that the planes are a distance h apart and that the circles that form the top and bottom of the frustum have radii a and b. Then the volume of the frustum equals .
Let l be the slant height of the frustum; that is, the length of the part of a generator between the top and bottom of the frustum. Then the area of the curved surface of the frustum equals π (a + b)l.
A frustum of a cone
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- intersect
- intersection
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- interseismic period
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- Intersputnik
- interstade
- interstadial
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