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Show that the points (p , q , r) , (q , r , p) and (r , p , q) are the vertices of an equilateral triangle.

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The correct Answer is:
`AB^(2) = BC^(2) = CA^(2)` i.e. `overline(AB)= overline(BC) = overline(CA) ` i.e., three sides of the triangle ABC are equal; hence the trinagle ABC is ana equilateral triangle .
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