Q.1Two lines are respectively perpendicular to two parallel lines. Show that they are parallel to each other.

Q.2 Prove that two lines that are respectively perpendicular to two ntersecting lines intersect each other.

Q.3Bisectors of interior ∠B and exterior ∠ACD of a Δ ABC intersect at the point T. Prove that ∠ BTC =1/2 ∠ BAC.

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