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A scientist is plotting the circular path of a partial on a coordinate plane for a lab experiment. The scientist knows the path is a perfect circle and that the particles start at ordered pair (-5, -11). When a particle is halfway down the circle, the particle is the ordered pair (11, 19). The segment formed by connecting these points has a center of the circle midpoint. a) What is the ordered pair that represents the center of the circle? b) What is the length of the radius, in units, of the circle? c) Explain why the the particle can never pass through a point with an x-coordinate of 24 as long as it stays on a circular path.

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  1. (a) the midpoint is just the average of the two end points: (6,4)
    (b) the radius is half the length of the line segment. Use your normal distance formula.
    (c) you have the center and radius. You can see that x=24 is too far from the center.

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    oobleck
  2. " start at ordered pair (-5, -11). When a particle is halfway down the circle, the particle is the ordered pair (11, 19). "
    This tells me that the two points in the above sentence form the diameter
    of the circle, so the center would be midpoint, which is
    ( (-5+11)/2 , (-11+19)/2 )
    = (3,4)
    so the circle is (x-3)^2 + (y-4)^2 = r^2
    but (-5,-11) lies on this, so
    (-5-3)^2 + (-11-4)^2 = r^2
    289 = r^2
    r = 17
    circle is (x-3)^2 + (y-4)^2 = 289

    if x = 24
    441 + (y-4)^2 = 289
    (y-4)^2 = -152
    so y-4 is not a real number, thus y is not a real number

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  3. dang! forgot to divide 6 by 2.
    Go with mathhelper's usual careful work.

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    oobleck

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