[Toán 7] Tam giác

L

langcam.vip

L

ludbs

EF cắt AD tại I, CF cắt AB tại J
ta có [tex]\hat{F}[/tex]=[tex]\hat{I}[/tex]-1/2[tex]\hat{C}[/tex]
=[tex]180^o[/tex]- [tex]\hat{A}[/tex]-1/2[tex]\hat{E}[/tex]-1/2[tex]\hat{C}[/tex]
=> 2[tex]\hat{F}[/tex]=[tex]180^o[/tex]-[tex]\hat{A}[/tex]-[tex]\hat{C}[/tex]+[tex]180^o[/tex]-[tex]\hat{A}[/tex]-[tex]\hat{E}[/tex]
= [tex]\hat{B}[/tex]+[tex]\hat{D}[/tex]
dpcm
 
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