Question

giúp mk vs, mk sẽ tick cho

Answer 1

\(\Delta AHB=\Delta AHC\Rightarrow\widehat{AHB}=\widehat{AHC}\) (2 góc tương ứng)

Mà \(\widehat{AHB}+\widehat{AHC}=180^o\) (2 góc kề bù)

\(\Rightarrow\widehat{AHB}=\widehat{AHC}=90^o\)

\(\Rightarrow AH\perp BC\left(đpcm\right)\)

Answer 2

\(\Delta AHB=\Delta AHC\Rightarrow\widehat{AHB}=\widehat{AHC}\left(2.góc.tương.ứng\right)\)

Ta có:\(\widehat{AHB}+\widehat{AHC}=180^o\left(2.góc.kề.bù\right)\\ \Rightarrow2\widehat{AHB}=180^o\left(vì\widehat{AHB}=\widehat{AHC}\right)\\ \Rightarrow\widehat{AHB}=90^o\\ \Rightarrow AH\perp BC\)