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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28. Five marks exercise problems XIV