con chó sì ta poi vn chơi freefire
\(a.Xét\Delta ABDvà\Delta KBDcó:\)
\(BÂD\)\(=\widehat{BKD}\)\(\left(=90^O\right)\)
\(BD:cạnhchung\)
\(\widehat{ABD}=\widehat{KBD}\)
\(\Rightarrow\Delta ABD=\Delta KBD\)( cạnh huyền - góc nhọn )
\(c.Tacó:IH\perp BC;DK\perp BC\Rightarrow IH//DK\)