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单词 frustum
释义

frustum

(frusta) 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 inline.

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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更新时间:2025/5/20 8:08:35