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7 May, 03:57

General form of the equation of a circle with its center at (-2, 1) and passing through (-4, 1)

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  1. 7 May, 07:50
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    hello:

    an equation of the circle Center at the A (a, b) and ridus : r is:

    (x-a) ² + (y-b) ² = r²

    in this exercice : a = - 2 and b = 1 (Center at the A (-2,1))

    r = AP ... P (-4, 1)

    r² = (AP) ²

    r² = (4+2) ² + (1-1) ² = 36

    an equation of the circle that satisfies the stated conditions.

    Center at A (-2,1), passing through P (-4, 1) is : (x+2) ² + (y-1) ² = 36
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