How to calculate board feet<br>Measure the length, width, and depth in inches. Use a stiff tape measure to measure the length, width, and depth of the board. Each measurement should be taken separately and recorded in inches.
Length and width are different dimensions of a board.
The text mentions three dimensions, length, width and depth and length and width are two of the three and are different.
( z1 differ :ARG1 ( z2 length :poss ( z3 board ) ) :ARG2 ( z4 width :poss z3 ) )