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If a vertex, the circumcenter, and the c...

If a vertex, the circumcenter, and the centroid of a triangle are (0, 0), (3,4), and (6, 8), respectively, then the triangle must be (a)   a right-angled triangle (b)   an equilateral triangle (c)   an isosceles triangle (d)   a right-angled isosceles triangle

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