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23 April, 13:58

What is the equation of the circle, with centre (-2,-7) and radius 3 units?

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Answers (2)
  1. 23 April, 14:02
    0
    (x + 2) ² + (y + 7) ² = 9

    Step-by-step explanation:

    The equation of a circle in standard form is

    (x - h) ² + (y - k) ² = r²

    where (h, k) are the coordinates of the centre and r the radius

    Here (h, k) = ( - 2, - 7) and r = 3, thus

    (x - ( - 2)) ² + (y - ( - 7)) ² = 3², that is

    (x + 2) ² + (y + 7) ² = 9
  2. 23 April, 14:02
    0
    (x+2) ^2 + (y+7) ^2 = 9

    Step-by-step explanation:

    The equation of a circle is given by

    (x-h) ^2 + (y-k) ^2 = r^2

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

    Substituting into this equation

    (x--2) ^2 + (y--7) ^2 = 3^2

    (x+2) ^2 + (y+7) ^2 = 3^2

    (x+2) ^2 + (y+7) ^2 = 9
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