From a formula located here: http://www.1728.org/quadltrl.htm we see that <span>4 • Side² = Long Diagonal² + Short Diagonal² Long Diagonal = 24 Short Diagonal = 10 </span><span>4 • Side² = 24^2 + 10^2 </span> <span>4 • Side² = 576 + 100 </span><span>4 • Side² = 676 </span><span><span>Side²</span> = 169 Side (or line AB) = 13