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#1 Re: Help Me ! » 3d geometry? » 2017-12-27 15:35:18

Cut the frustum and inscribed sphere with a vertical plane passing through the center of the sphere and perpendicular to the two bases.

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Let the slant height

and the radius of the circle

Let

since
and
, Since
. From
draw a perpendicular to base
at point
, then
is a right triangle, where
and
. Since the radius of the smaller base
we choose
  the volume of the frustum 

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