Drepte perpendiculare in triunghiul echilateral
Scris: Lun Mai 29, 2017 7:50 am
Fie $ABC-$un triunghi echilateral si 2 puncte: $D\in[AB],\,E\in[BC],$ astfel incat sa avem: $|BD|=2.|AD|$ si $|CE|=2.|BE|.$
Notam cu$\{P\}=[AE]\cap [CD].$ Aratati ca: $BP\perp CD.$
Notam cu$\{P\}=[AE]\cap [CD].$ Aratati ca: $BP\perp CD.$