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30 May, 15:26

The graph of the equation below is a circle. What is the length of the radius of

the circle?

(x + 5) 2 + (y + 7) 2 = 212

O A. 441

O B. 42

O C. 10.5

O D. 21

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Answers (1)
  1. 30 May, 17:11
    0
    D. 21.

    Step-by-step explanation:

    The general form of the equation of a circle is:

    (x - a) ^2 + (y - b) ^2 = r^2 where r is the radius.

    Comparing:

    (x + 5) ^2 + (y + 7) ^2 = 21^2

    So r^2 = 21^2

    making r = √21^2

    = 21.
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