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Math Help - equation of a circle (center-radius form to general form oddity?)

  1. #1
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    equation of a circle (center-radius form to general form oddity?)

    I recently came across a description of a unit circle's equivalency from center-radius to general form that looked quite odd to me. From a center radius form of (x-0)^2 + (y-0)^2 = 1^2 the equation went to (x^2)x + (y^2)y - 1 = 0. The -1 is quite obvious, but I can't figure out how the x and y terms converted to (x^2)x (y^2)y. Where did this additional x and y come from? To me that's x^3 & y^3. This MUST be a typo, right?
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  2. #2
    MHF Contributor MarkFL's Avatar
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    Re: equation of a circle (center-radius form to general form oddity?)

    Yes, that is a typo I would say.
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  3. #3
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    Re: equation of a circle (center-radius form to general form oddity?)

    Thanks again
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