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Math Help - help in this math project

  1. #1
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    help in this math project

    help would be appreciated if u can solve it all i will be very thankful and i would like some hints too
    Attached Thumbnails Attached Thumbnails help in this math project-scan0001.jpg  
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  2. #2
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    What have you done so far? Where are you stuck? What formulas do you know about circles?
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  3. #3
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    The equation of a circle is (x-a)^2 + (y-b)^2 = r^2

    where  (a,b) is the centre of the circle and r the radius.
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  4. #4
    Super Member Aryth's Avatar
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    x^2 + y^2 - 2x - 4y - 4 = 0

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

    Complete the square for both:

    (x^2 - 2x + 1) + (y^2 - 4y + 4) = 9

    Now we factor:

    (x - 1)^2 + (y - 2)^2 = 3^2

    Therefore, r = 3 and the center is (1, 2)
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