$\widehat{mOr}=90^{\circ}+20^{\circ}=110^{\circ}; $
$\widehat{pOq}=\widehat{qOr}=20^{\circ}; $
$\widehat{mOn}=(90^{\circ}-20^{\circ})/2=35^{\circ};$
$\widehat{nOq}=35^{\circ}+20^{\circ}=55^{\circ}$
$\widehat{mOr}=90^{\circ}+20^{\circ}=110^{\circ}; $
$\widehat{pOq}=\widehat{qOr}=20^{\circ}; $
$\widehat{mOn}=(90^{\circ}-20^{\circ})/2=35^{\circ};$
$\widehat{nOq}=35^{\circ}+20^{\circ}=55^{\circ}$