Solution
Part 1
For this case we can find DF with the following proportion formula:
[tex]\frac{AC}{AB}=\frac{DF}{DE}[/tex]
And replacing we got:
[tex]\frac{4}{2}=\frac{DF}{1.34},DF=2.68[/tex]
Part 2
[tex]\frac{BC}{AB}=\frac{EF}{DE}[/tex]
And solving for EF we got:
[tex]EF=1.34\cdot\frac{3}{2}=2.01[/tex]
