Have you considered a piece of paper and a scaled ruler?
If you want for now or for future projects, you can download the free drawing program SketchUp. Since you have the measurements, you can draw the triangle and the siding and see what you come up with.I want to install Hardie lap siding. I know all the dimensions of the triangle shaped area and want to use a computer program to lay out each piece to look at it and be able to see the lengths of the partial pieces left over of a 12 ft board to be able to be used higher up. Its easy to figure the square footage but I want to go a step farther. This would also make the material cost easier to estimate knowing the amount of material needed. Would like to use the simplest program. Free would be good but not necessary. What would some of you suggest ? Thanks. *BW*
Add 10% onto your SF and that will get you close. If you're trying to figure out exactly (to the piece) what you'll need on a whole house then you're over thinking this (to many variables).easy to figure the square footage but I want to go a step farther.