Is ABCD is a parallelogram? — task. Mathematics State Board, Class 10.

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Prove that

$ABCD$ is a parallelogram with points

$A(2, 2)$ ,

$B(4, 6)$ ,

$C(7, 8)$ and

$D(5, 4)$ .

The slope of

$AB$

$=$

$i$

The slope of

$BC$

$=$

$\frac{i}{i}$

The slope of

$CD$

$=$

$i$

The slope of

$DA$

$=$

$\frac{i}{i}$

$ABCD$ is a .

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