The known side is 3 times the length of the smaller figure. To make sure the figures remain similar, you must also multiply the longer side of the smaller figure(15) by 3. This will give you 45.
The answer is one because if the small rectangles perimerter is 50 then you want to get as close to that as you can so the length of the other one in 1 which makes the perimeter 61 and then youd round to 60
