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30 April, 06:58

What is the radius of the circle given by the equation x^2+y^2=49?

A. 3

B. 5

C. 7

D. 49

+3
Answers (2)
  1. 30 April, 07:02
    0
    Formula of the circle

    (x-a) ² + (y-b) ² = r²,

    where r is a radius, (a, b) - coordinates of the center.

    So,

    x² + y² = 49

    (x-0) ² + (y-0) ² = 49.

    Center of this circle has coordinates (0,0).

    x² + y² = 7²

    r = 7

    Answer is C. 7.
  2. 30 April, 07:25
    0
    The answer is "C. 7."

    The equation of a circle is (x-h) ² + (y-k) ²=r². r² represents the radius squared, or multiplied by itself. 7 multiplied by 7 is equal to 49, so the radius of the circle would be 7.
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