learawass2009 learawass2009
  • 14-11-2022
  • Mathematics
contestada

5 BEL is an isosceles triangle of vertex B.
[ET] and [LS] are the altitudes relative
to the equal sides.
1º) Prove that ET = LS.
2º) Deduce that ES = LT and that
triangle BST is isosceles.

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