Ononot — If the vertices of a triangle are A(0, 0), B(2, 0), and C(1,

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Coordinate Geometryhard

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If the vertices of a triangle are $A(0, 0)$ , $B(2, 0)$ , and $C(1, k)$ , for what value of $k$ is the triangle a right-angled triangle at $C$ ?