Rectangle, F=1, A is the length of the bottom edge, B is high..... So, S1S2, S3,..., one by one. The sum of the above Si is the total area. The amount of template engineering is required
A, length, B width or height. Such as triangle F=0.5, A for the bottom edge of the length, B is high
The template will be installed to expand into one piece, each piece of the area is Si=F*A*B, the formula, F coefficient
