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H

hien_vuthithanh

Kẻ $OH ,OK$ lần lượt vuông $AB,AC$

$\Longrightarrow AH=2,5 ; AK=1$

AD Phytago : $OH=\sqrt{AO^2-AH^2}=\sqrt{R^2-AH^2}=...$

$OK=\sqrt{AO^2-AK^2}=\sqrt{R^2-AK^2}=...$
 
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