I need to make a net for a frustum. The following web page explains how to do it... http://www.analyzemath.com/Geometry/conical_frustum.html I have tried but am unable to do this complicated, advanced (o.k basic) math. In the following figure I have the values R,r and h. R = 40 r = 35 h = 83 I need the values for x,y,t and H in the following figure so I can construct my net. x = ? y = ? t = ? H = ? Can anyone please help me find x,y,t,H ???