To find the ratio of the side opposite angle A to the hypotenuse of triangle ABC, we first identify the lengths of the sides: AB = 6 (opposite side), AC (hypotenuse) = 10. We then calculate the ratio as 6/10, which simplifies to 3/5. With this ratio, we look at the corresponding side lengths in the second triangle, where the hypotenuse is 40 (the longest side).
Using the ratio of 3/5, we can set up the equation: opposite side / hypotenuse = 3/5. Let the opposite side be x. Thus, \( x / 40 = 3/5 \), which leads us to find \( x = (3/5) * 40 = 24 \). Therefore, point A' is located opposite the side of length 24 in triangle A'B'C'.