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Question

In the adjacent Figure ,

if seg AB || seg PQ , seg AB seg PQ, seg AC || seg PR, seg AC seg PR then prove that, seg BC || seg QR and seg BCseg QR.

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Solution

Given: seg AB || seg PQ , seg AB seg PQ
So, ABQP is a parallelogram as the pair of opposite sides are congruent and parallel.
Thus, seg AP || seg BQ , seg AP seg BQ .....(1)
Similarly, seg AC || seg PR, seg AC seg PR
So, APRC is a parallelogram.
Thus, seg AP || seg CR, seg AP seg CR .....(2)
From (1) and (2) we have
seg BQ || seg CR
Also, seg BQ seg CR
Thus, BQRC is a parallelogram as the pair of opposite sides are congruent and parallel.
Therefore, seg BC || seg QR and seg BCseg QR as BQRC is a parallelogram.

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