To calculate the diagonal of a square multiply the length of the side by the square root of 2. D l² w². If you know.
Diagonals of a square Length of the diagonal.
Both legs of each one of the triangles are sides of the square so their side is known and equal to a. In the figure above click reset. After that put the value in the formula d s2. Before we look at what the trace of a matrix is lets first define what the main diagonal of a square matrix is.