Not a homework question, no worries. :) It's actually a work question. We have a slope top foundation that we need to slice - effectively, we will be slicing a cone in the xz or yz plane as to form a hyperbola. With this done, we are able to come up with 3 sets of points for our shape from basic geometry. (0,0) (15.865,1.2025) (31.73,0) The foundation is made of up effectively 2 pieces. Base piece is a cylinder. Top is a conical frustum. If you only consider the frustum, imagine a slice going vertically at some point along the slanted wall and you pretty much have the piece we're investigating. I want to model it to get the surface area of the sliced face through some equation. is anyone able to help or give some references for this? Thanks.