how to measure a roof 3

https://wiki-net.win/index.php/How_to_Calculate_Roof_Square_Footage_for_Accurate_Material_Estimates

To measure a roof, start by sketching its shape from the ground. Then, safely climb up with a tape measure and record the length and width of each plane, including overhangs. For pitch, measure the vertical rise over 12 inches of horizontal run. Multiply length by width for each section, then add them all up for total square footage. Don't forget to include waste for cuts and valleys, usually adding about 10%.