ABC is similar to DEC. Find the length of x. AB=11.25 DE= 1.25 EC= 2.7 and x =BC. I have no clue . Frustrated!

Answer 1

Simple!
You must have learned that for similar triangles the corresponding sides are in the same ratio, so

x/11.25 = 2.7/1.25
x = (2.7/1.25)(11.25) = 24.3

Answer 2

Triangle abc is similar to triangle def.
Find the perimeter of def