Question 1131874
Assuming we are taking all measurements at the same height (say, at the floor), you can apply the Pythagorean theorem (l^2 + w^2 = h^2, where h=diagonal)<br>

Solving for length, length = sqrt(h^2 - w^2):<br>

length = {{{ sqrt(37^2 - 12^2) = sqrt(1225) = highlight(35) }}} meters.