we know that having similar triangles so the ratio of sides,area and volume are same.

we know that
will be the area of triangle.

so 
so the ratio of the perimeter of two triangles will be

ratio of the perimeter=
Answer:
21, 34, and 55 because it's like that one ratio, I forgot the name tho
Answer:
umm... there is no problem
CD = XY = 26 mm
hope that helps