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Question

Show that the points A(3, 1), B(0, -2),C(1,1) and D(4, 4) are the vertices of a parallelogram ABCD.

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Solution

The given points are A (3,1), B(0,-2) and C(1,1), D(4,4). Then

AB =(03)2+(21)2

=(3)2+(3)2

=18 units

BC =(10)2+(1+2)2

(1)2+(3)2

=10 units

CD =(41)2+(41)2

=(3)2+(3)2

=18 units

AD =(43)2+(41)2

=(1)2+(3)2

=10 units

Thus, AB = CD =18 units and BC = AD =10 units.

So, quadrilateral ABCD is a parallelogram


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