verify (-1,2,1), (1,-2,5), (4,-7,8), (2,-3,4) are the vertices of a parallegram
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Let the points given be A,B,C,D.
it's easy first find distances of AB, BC, CD, AD.
then prove AB=CD& BC=AD. opp.sides of IIgm.
it's easy first find distances of AB, BC, CD, AD.
then prove AB=CD& BC=AD. opp.sides of IIgm.
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