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| Math Central | Quandaries & Queries |
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Question from Lily, a student: A cone of height 6in. and radius of base 4in. has its top cut off by a plane parallel to its base and 4in from it. I have worked out the volume of the entire cone but I don't know how to work out the radius of the top of the frustum. Thanks |
Hi Lily,
In the diagram below the triangles ABC and ADE are similar.
Write back if you need more assistance,
Penny
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