There should be four equal size rectangles formed once the vertical and horizontal balusters are in place.
For the length of the diagonal piece or side C, which will be measured along the centerline of the piece...not the edge, use the measurements of the width and height of the rectangles for sides A and B......the length of side C and the angle cuts will be calculated by the app.
Pythagorean theorem states A squared + B squared = C squared. Same way rafter length is determined. But this app gives the precise angles for the verticle and horizontal cuts as well as the length.
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