In the attached part you will see I have four angular cuts to make a trapezoidal pyramid.  I made an angular plane, extruded the cut, etc.  To make four of them, rather than do this process 4 times, I revolved the cut around the hole in the top.  However, I was unable to do so with just a sketch.  So, if I were to make this same part without the hole, how would I go about making my circular array of cuts- i.e., what would I revolve them around?