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Posted by on Sunday, December 5, 2010 at 4:32pm.

1.)Find the equation of the circle with center (1, 3) and radius r =2.


2.)Find the area of the circle of the above problem?

  • algebra - , Sunday, December 5, 2010 at 4:41pm

    2) I'll start with this part of the problem first. You know the radius of the circle is 2.
    And the area of a circle is pi*(radius^2)
    So pi*(2^2) = 4*pi...

    1) So first get a piece of paper and pencil. I'll wait.
    Ok. Now that you have a paper and pencil draw the x-y coordinate plane (2 perpendicular lines, the horizontal is the x, the vertical is the y). Mark off 5 tick marks on each line. This will be good practice.

    Using this coordinate plane, and knowing that the x and y values of the center of the circle are 1 and 3 respectively, plot this point. Then plot the points that are 2 to the left of the center, 2 to the right, 2 below the center, and 2 above.

    Connect the 4 points around the circle, and you've drawn the circle.

    The equation of a circle is as follows:

    (x-h)^2 + (y-k)^2 = radius^2. where the center is (h, k).

    If h is 1, k is 3, and radius = 2.... I think you can take it from here. Hope this helped. Peace out.

  • algebra - , Sunday, December 5, 2010 at 4:48pm

    Thanks!

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