How to measure area of a non-orthogonal surface?

[patricks]

Is there any quick and easy way to measure the area of a single non-orthogonal surface, i.e. something not horizontal or vertical, such as a single face of a roof? Sure there are ways I can calculate it, but depending on the roof complexity it can get to be pretty complicated with increased chance for error. I'm just looking for something, maybe some type of tag, or something that would show me the area of a sloping face. And I mean the true area, not the projected area as if looking at it flat. Any ideas?

[Alfredo Medina]

Modify > Paint > material "x".
Material take-off schedule > roofs > material:name, material:area
the area of material "x" is the area of the face.