Solve for a side in right triangles can someone please answer its very urgent

What is the ratio for the surface areas of the cones shown below, given that they are similar and that the ratio of their radii and altitudes is 2: 1? submit

Abcd is reflected across the x- axis, then rotated 90 clockwise about the orgin, and finally reflected across the line y= x to form a’ b’ c’ .

Marco states that 7.696696669…… is a rational number because it is a repeating decimal. is he correct? justify your answer.