Five marks exercise problems XIV — task. Mathematics State Board, Class 9.

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Verify that the following points taken in order form the vertices of a rhombus.

$A(1, 1))$ ,

$B(2, 1)$ ,

$C(2, 2)$ ,

$D(1, 2)$

$AB = i$

$BC = i$

$CD = i$

$DA = i$

$ABCD$ is .

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