Slope is just rise over run. If you draw a line from the front edge of one tread, to the front edge of the tread above it, then the angle formed by that line and the lower tread is:
tangent of that angle = rise over run or: inverse tangent of rise over run = that angle. -- Blue skies. Dan Rossi Carnegie Mellon University. E-Mail: [EMAIL PROTECTED] Tel: (412) 268-9081
