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

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Show that the following points taken in order form an isosceles triangle.

$A(6, -4)$ ,

$B(-2, -4)$ ,

$C(2, 10)$

Proof:

$AB = i$

$BC = i \sqrt{i}$

$CA = i \sqrt{i}$

and

Thus, the triangle

$ABC$ is an isosceles triangle.

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