OL là p/g \(\widehat{HOI}\) nên \(\widehat{HOL}=\widehat{LOI}=\dfrac{1}{2}\widehat{HOI}=30^0\)
\(\widehat{MOK}+\widehat{HOM}=180^0\left(kề.bù\right)\\ \Rightarrow\widehat{MOK}+\widehat{HOL}+\widehat{LOM}=180^0\\ \Rightarrow\widehat{MOK}=180^0-30^0-90^0=60^0\)