✿ [tex]\mathsf{Scale\;Factor = \frac{1.5}{2.5} = \frac{15}{25} = \frac{3}{5}}[/tex]
[tex]\mathsf{\implies Length\;of\;DF = \frac{3}{5} \times AC}[/tex]
[tex]\mathsf{\implies Length\;of\;DF = \frac{3}{5} \times 4}[/tex]
[tex]\mathsf{\implies Length\;of\;DF = (0.6)(4)}[/tex]
[tex]\mathsf{\implies Length\;of\;DF = 2.4\;u}[/tex]
