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    hollz0143's Avatar
    hollz0143 Posts: 1, Reputation: 1
    New Member
     
    #1

    Sep 21, 2005, 05:25 PM
    please help me with pre-cal
    it says write the standard form of the equation and the general form of the equation of each circle of radius r and center (h,K). By hand graph each circle

    r=2; (h,k) = (-2,1)
    reinsuranc's Avatar
    reinsuranc Posts: 92, Reputation: 6
    Junior Member
     
    #2

    Sep 24, 2005, 06:36 PM
    The equation of a circle with center x=h and y=k and radius r, is:

    (x - h)^2 + (y - k)^2 = r^2. Here I am using the symbol ^ to indicate exponentiation.

    In your example, h=-2, k=1, r=2.

    (x - -2)^2 + (y - 1)^2 = 2^2, or

    (x + 4)^2 + (y - 1)^2 = 4.

    You need to draw a graph of a circle with center (-2,1) and radius 2.

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