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2 June, 08:53

What is the radius for the circle given by the equation x^2 + (y-3) ^2=21

Round your answer to the nearest thousanth.

+2
Answers (2)
  1. 2 June, 09:12
    0
    x² + (y - 3) ² = 21

    We know the formula is (x - xo) ² + (y - yo) ² = r²

    So, 21 is the radius²

    21 = r²

    r = √21

    r = 4,58257

    Rounding

    r = 4,583
  2. 2 June, 09:15
    0
    4.583

    Step-by-step explanation:

    Equation of a circle is:

    (x - h) ² + (y - k) ² = r²

    where (h, k) is the center of the circle and r is the radius.

    x² + (y - 3) ² = 21

    The center of the circle is (0, 3), and the radius is √21, or approximately 4.583.
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