theorem 3 if a straight line intersects two straight lines and if (i) measurement of one pair of alternate angles is equal or (ii) sum of measurement of two interior angle of the same side of the transversal is two right angles then two straight lines are parallel. (this theorem can be proved by axiom - 4)
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If a straight line intersects two parallel straight lines the pr. If a transversal intersects two lines such that the bisectors of a pair of corresponding angles are parallel, then prove that the two lines are parallel.
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