If the ratio is 16:9, call the horizontal edge A and the vertical edge B. A=16x, B=9x. For a rightangled triangle, A2+B2=702. So (16x)2 + (9x)2 = 4900. From here:
(16x)2 + (9x)2 = 4900
256x2 + 81x2...
This cannot be answered without knowing one of the other dimensions.Or else you need to know the surface area. Or else you need the angle of the diagonal with relation to one of the sides.Or else you...