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  1. M

    AS level maths help!

    now similarly find the equation of AB and find the intersection of AB and BD which gives you the coordinate of B... and now find the coordinate of D by using the midpoint formula...... good luck
  2. M

    AS level maths help!

    the diagonals of square bisect each other at right angles.. so the midpoint of AC is also the mid point of BD so. midpoint of AC is: x=(7+ 1)/2 =4 y=(2+4)/2 =3 so the coordinate of midpoint is (4,3) now the gradient of AC =(Y2-Y1)/(X2-X1) = (4-2)/(1-7) = -1/3 since AC and BD...
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