Joined: May 12, 2013
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Roofs, ceilings, angles and intercepting walls
Sometimes discussions about how to figure out angles and split sloping walls come up in the forum: Eg.thread 2054: Splitting sloping walls? , with some hints on the easiest ways of finding out how high a wall is on a given point (and how to calculate roof slope / angles), and thread 5144: calculating angle with a spreadsheet for angles.
I put some of this into GeoGebra, a student math tool, and uploaded an interactive web-version where it is possible to move points and see the values adjust. It will give angles (also slopes in fraction of 12). Don't know if it is useful for anyone but myself, but along with a smartphone app to measure angles, this seems an easier way of getting the slopes right without calculations.
