(Hình 9) Tính

B

baochau15

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H

huuthuyenrop2

từ C hạ đg cao CK
ta có:
$CK=\sqrt{20^2-12^2}=16$

\Rightarrow CK=AD=16
Xét $\Delta$ ADB có:
BD=34
$CA=2\sqrt{145}$
$\widehat{DAC}=48^037'$
 
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