Đáp án:
Giải thích các bước giải:TA co IK LA DUONG tb
tam giac FED suy ra IK SONG SONG ED
IK =1/2 ED (1)
MN la duong TB cua tam giac BED suy ra MN SONG SONG VS ED
MN =1/2ED (2)
tu (1)va (2) suy ra MN song song vs IK SONG SONG ED
MN=1/2ED=IK
TUONG TU: IN song SONG KN song song BF
IN=KN
MA ED VUONG GOC VS BF SUY RA MN VUONG GOC VS IM
SUY RA IM VS KN LA HINH VUONG SUY RA IN =KM