The surface areas of similar solids is proportional to the square of their sides <span>since the ratio of sides is 1 : 3 </span> <span>their surface areas have the ratio 1</span>²<span>: 3</span>²<span> or 1:9 </span> <span>so the surface area is 9(10.4) or 93.6 </span>
<span>or </span>
<span>original width = x </span> <span>original length = y </span> <span>original heigt = z </span> <span>original surface area = 2(xy) + 2(xz) + 2(yz) </span> <span>= 2(xy + xz + yz) </span>