In any quadrilateral the two lines joining the mid-points of each pair of opposite sides meet at one point, with the line joining the mid-points of its diagonals. CONSTRUCTION : Let ABCD be the quadrilateral and E, F, G, H, K, and L the mid-points of its sides and diagonals. Join EF, FG, GH, HE, EK, KG, GL, LE, FK, KH, HL, and LF (Fig. A B H D

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A: Point B , (-9,-8)

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