geometry
posted by mily on .
Triangle ABC is similar to triangle DEF. The sides of ABC are 5,8 and 11. What is the length of the shorttest side of DEF if its perimeter is 60?

Since the sides must be in the same ratio...
let the sides of the new triangle be
5x, 8x, and 11x
5x + 8x + 11x = 80
solve for x, then find 5x 
5x + 8x + 11x = 60 , hit the wrong key

12.5

mc0691.jpg
In mc0692.jpg, FE = 13 and mc0693.jpg. Find DF to the nearest tenth.