Which of the following proportions verifies that ABC and XYZ are similar?
They need to satisfy:
[tex]\begin{gathered} AB\propto XY \\ AC\propto XZ \\ BC\propto YZ \end{gathered}[/tex]Therefore:
[tex]\frac{AB}{XY}=\frac{AC}{XZ}\Leftrightarrow\frac{AB}{AC}=\frac{XY}{XZ}[/tex]Answer:
A