Ononot — Two circles x^2 + y^2 = 1 and x^2 + y^2 - 6x - 8y + k = 0 ar

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Circles & Conicshard

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Two circles $x^2 + y^2 = 1$ and $x^2 + y^2 - 6x - 8y + k = 0$ are orthogonal. Find $k$ .