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# In figure, find the values of x and y and then show that AB ||CD.

$$\because$$ x + 50° = 180° .....(Linear pair)
$$\Rightarrow$$ x = $$130^\circ$$
$$\therefore$$ y = $$130^\circ$$ .....(vertically opposite pair)

Here, these are corresponding angles for lines AB and CD.

Hence, it is proved that AB || CD.