[Toán 9] Góc

L

long09455

H

huuthuyenrop2

Ta có:
$\widehat{BCF}=\widehat{AEF}=90^0$

$\Rightarrow CFED nt$

$\Rightarrow \widehat{CFD}=\widehat{CED}$

Mặt khác: $\widehat{CED}=\widehat{OBC}=\widehat{OCB}$

$\Rightarrow \widehat{CFD}=\widehat{OCB}$
 
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