BdMO National 2012: Secondary 8

Discussion on Bangladesh Mathematical Olympiad (BdMO) National
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Rabeeb
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Re: BdMO National 2012: Secondary 8

Unread post by Rabeeb » Thu Feb 07, 2013 10:04 pm

@Tahmid
How can we say that
$\angle DAE+\angle ECD=180^{\circ} \Rightarrow \angle DAE+2(\angle DAC+\angle ACD)$
$\Rightarrow 3\angle DAE=180^{\circ}$
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