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Using the Distance Formula to Compute the
Radius of a Circle Centred at the Origin

Do the points (-3, 4), (0, -5) and (Ö21, -2) all lie on a circle with its centre at (0, 0)?
Follow the directions in the question box to see how the distance formula can be used to answer this question.
Check out how this works for circles centred off the origin.


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