bai 179 sach nang cao va phat trien toan 7 tap 2

C

chicomot

D

duypro.95

a

ta co BE = EO = HE ( Vi tam giac BHO vuong tai H )\Rightarrow HEO can tai E (1)

tuong tu ta co tam giac KFO can tai K(2)

mat khac : gocHBO = gocKCO \RightarrowgocHOE = gocKOF(3)

Tu (1),(2), (3) \RightarrowHOE = EOH = FKO = FOK


\RightarrowTAM giac HEO dong dang voi tam giac KFO

\Rightarrowgoc OEH = goc OFK:)
 
You must log in or register to reply here.
Top Bottom