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B
y=25o
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C
z=155o
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D
All of these
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Solution
The correct option is D All of these 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