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

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Show that the following points taken in order form an equilateral triangle in each case.

\(A(2, 2)\), \(B(-2, -2)\), \(C(-2\sqrt{3}, 2\sqrt{3})\)

Proof:

AB = i \sqrt{i}

BC = i \sqrt{i}

CA = i \sqrt{i}

\(ABC\) is .

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23. Five marks exercise problems XI