Z00081. A formula for the length of a diagonal from the upper corner of a box to the opposite lower corner is D = (L^2 + B^2 + H^2)^0.5 where, L, W and H are the length, width and height respectively. Find the length of the diagonal of the box if the length is 23 inches, width is 15 inches and height is 7 inches. Leave your answer in simplified radical form.