Question

Jenny

求解

(B)2 (C) (D)3
40. ( )如圖,在△ABC中,已知D 為 4C中點,
F為BD中點,DG || AE,若BC=18,
則 EG = ?
A
B
E
G
C
(A)2 (B)3 (C)6 (D)9

Answer 1

Mer

DG//AE
故EG:CG=AD:DC=1:1
FE//DG
故BE:EG=BF:FD=1:1
得BE:EG:CG=1:1:1
EG=(1/3)BC=6