Question

Triangle ABC

A
B
C
and triangle DEF
D
E
F
are similar. What is the measure of side DF
D
F
?

Answer 1

19cm

Explanation:

I think it's 19cm as sides BC on the green triangle measure 15cm, and EF is 25cm on the blue triangle. It also mentions that they are similar, meaning that ∆ DEF is just a translated and enlarged version of ∆ ABC

25 - 15 = 10cm

9 + 10 = 19cm

Hope this helped :)