Horizontal lines run left to right, parallel to the horizon, with slope 0 and equation y = k. Vertical lines run top to bottom, perpendicular to the horizon, with undefined slope and equation x = k.
Extreme How-To on MSN
The Easiest Way to Measure the Slope of a Roof
A carpenter’s square (L-shaped) is probably the simplest tool to measure roof slope, which is also referred to as the roof’s ...
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