We know that ABCD is similar to EFGH so that means you can use a scale factor for them to figure out the rest of the side lengths.
25/12.5=2
12/6=2
Therefore the scale factor is two. Then we can use the numbers from the other side lengths which are 12 and divide by 2. Which gets you 6 for each remainder of the sides.
So 6 times 6 is 36 so 36 possibilities and the number that add up to 3 or nine are (2,1; 3,6; 4,5;) so 3 out of 36 or 1 out of 12, the answer is not there
