# Line Intersections

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If P, Q are the midpoints of AB, CD respectively prove that

i) AC + BD = 2PQ

ii) AC+BC+AD+BD=4PQ

ABCD is a quadrilateral. The midpoints of AB, BC, CD and DA are P,Q,R and S. Prove PQRS is a parallelogram.

Find perpendicular distance from point... to line...

Intersecting lines and point of intersection.

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##### Solution Summary

Intersecting lines are investigated. The solution is detailed and well presented.

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