Question

Se considera tringhiul ABC si punctele D si E, D apartine (AB), E apartine (AC), astfel incat DE║BC.AflatiȘ
c) Daca DB=6 cm, AB= 9 cm, Ac=12 cm, calculati AD,AE,EC.
d)Daca AD=8 cm,Ae=6 cm si AC=10 cm , calculati EC,DB,AB
e) Daca Ab=12 cm,AE=10 cm,EC=6 cm,calculati AD,DB,AC.
f)Daca AB=18 cm,AC=20 cm,EC=15 cm,calculati AD,DB,AE
Dau coroana.

Answer 1

c)AD=AB-DB=9cm-6cm=3cm.
Daca DE||BC=> T.Thales: AD/AB=AE/AC =>3/9=AE/12 => AE=3*12/9=4cm
EC=AC-AE=12-4=8cm.