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Question -

Which pair of lines in the figure are parallel? Give reasons.



Answer -

Given : In the figure, тИаA = 115┬░, тИаB = 65┬░, тИаC = 115┬░ and тИаD = 65┬░
тИ╡ тИаA + тИаB = 115┬░+ 65┬░= 180┬░
But these are co-interior angles,
тИ┤ AD || BC
Similarly, тИаA + тИаD = 115┬░ + 65┬░ = 180┬░
тИ┤ AB || DC

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