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5 November, 19:14

The equation of a circle centered at the origin is x2 + y2 = 16. What is the radius of the circle?

A. 8

B. 16

C. 4

D. 256

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Answers (2)
  1. 5 November, 19:28
    0
    The radius of circle is 4

    Step-by-step explanation:

    Given as:

    The equation of circle is given as:

    x² + y² = 16

    Now The standard equation of

    (x - h) ² + (y - k) ² = r²

    where h, k are center of circle

    r is the radius of circle

    From given circle equation x² + y² = 16 can be written as

    (x - 0) ² + (y - 0) ² = (4) ²

    So, The center of this circle is (h, k) = (0, 0) And radius of circle = 4

    Hence The radius of circle is 4 Answer
  2. 5 November, 19:37
    0
    C 4

    Step-by-step explanation:

    well 4x2 + 4x2 = 16

    and radius is 1/2 of diameter so 1/2 of 8 is 4
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