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Question

Figure given above shows a pair of parallel lines cut by a transversal. For given case, find a and b, giving reasons.

Solution
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Referring the given figure,
$$a = 60^\circ$$ [Alternate interior angles]
$$b = 180^\circ - a$$ [Co-interior angles]
$$= 180^\circ - 60^\circ$$
We get,
$$b= 120^\circ$$

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