Which pair of lines in fig 8.119 are parallel? Given reasons

Question

Philoid · Accepted Answer

∠A + ∠B = 115^o + 65^o

= 180^o

Therefore,

AB ‖ BC, as sum of co interior angles are supplementary.

∠B + ∠C = 65^o + 115^o

= 180^o

Therefore,

AB ‖ CD, as sum of co interior angles are supplementary.