KE ⋂ DB = X
XP ⋂ AB = F
XP ⋂ DA = G
KEFG - сечение
т Менелая
DK/KC *CE/EB *BX/XD =1
4/1 *1/1 *BX/XD =1 => BX/XD =1/4 => DB/BX =3/1
DP/PD1 *D1F/FB *BX/XD =1
1/1 *D1F/FB *1/4 =1 => D1F/FB =4/1 => AF/FB =9/1
AG/GD *DP/PD1 *D1F/FA =1
AG/GD *1/1 *4/9 =1 => AG/GD =9/4
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Answers & Comments
KE ⋂ DB = X
XP ⋂ AB = F
XP ⋂ DA = G
KEFG - сечение
т Менелая
DK/KC *CE/EB *BX/XD =1
4/1 *1/1 *BX/XD =1 => BX/XD =1/4 => DB/BX =3/1
DP/PD1 *D1F/FB *BX/XD =1
1/1 *D1F/FB *1/4 =1 => D1F/FB =4/1 => AF/FB =9/1
AG/GD *DP/PD1 *D1F/FA =1
AG/GD *1/1 *4/9 =1 => AG/GD =9/4