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2014-06-05T17:51:01+03:00
ABCD trapez isoscel deci AD≡BC si unghiurile de la baza congruente
fie DE si CF inaltimile in trapezul isoscel
ΔADE≡ΔCFB Δdreptunghice (DE≡CF, AD≡BC)⇒AE≡FB
AB=AE+EF+FB=2AE+CD⇒AE=(AB-CD)/2
Δ  ADE Δdreptunghic AD²=AE²+DE²

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