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can anyone direct me how to draw a quadrangular frustum pyramid on a already-done quadrangular prism?

Question asked by Japhen Huang on Mar 12, 2015
Latest reply on Mar 13, 2015 by Japhen Huang

can anyone direct me how to draw a quadrangular frustum pyramid on a already-done quadrangular prism? As shown in the attached picture, I have already done on the prism, but just don't know how to proceed the step 2.  I was driven mad by this:(  Many thanks in advance.

quadrangular frustum  pyramid.JPG

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