SincelinenandmintersecteachotheratpointO∠MON=25(given)∠MON=∠y(verticallyoppositeangles)∠y=25Since∠yand∠zformlinearpairofangles∠y+∠z=180(linearpairofanglesaddtoform180⟹∠z=180−∠y=180−25=155Also∠z=∠x=155(verticallyoppositeangles)Hence∠x=155,∠y=25and∠z=155