It is known that be is the middle line ad ⊥ BC in △ ABC, and it is shown that ad = be

It is known that be is the middle line ad ⊥ BC in △ ABC, and it is shown that ad = be

Let EF be perpendicular to F,
In the right triangle bef, ∠ CBE = 30 °,
EF=BE/2,
Ad is high, ad is parallel to EF, e is the midpoint of AC,
In triangle ADC, EF is the median line,
EF=AD/2,
AD=BE.