Posted by Dave on January 25, 2001 at 09:54:48:

In Reply to: checking for square posted by Dan on January 25, 2001 at 09:53:36:

To calculate the diagonal (corner to corner distance), use the formula:

length*length + width*width = diagonal*diagonal

Rearrange this to:

diagonal = square root( length*length + width*width )

21.26 = sqrt( 14*14 + 16*16)