Since = = =

Then, _{ΔABC ~ ΔDEF (By SS similarity)}

Now, In _{ΔABL ~ ΔDEM}

_{<B = <E (ΔABC ~ΔDEF)}

_{<ALB =<DME (Each 90°)}

_{Then, ΔABL ~ ΔDEM (By SS similarity)}

_So, (Corresponding parts of similar triangle area proportion)

Or

Or,