1.   Find an equation of the circle whose center is at (-2, 4) and has radius 5.
    A. (x - 2)2 + (y + 4)2 = 5
    B. (x + 2)2 + (y - 4)2 = 5
    C. (x + 2)2 + (y - 4)2 = 25
    D. (x - 2)2 + (y + 4)2 = 25
    Hint

  2.   Find an equation of a circle if the endpoints of a diameter are at (-2, -3) and (1, 7).
    A.
    B. (x - 1)2 + (y - 7)2 = 109
    C.
    D. (x + 2)2 + (y + 3)2 = 109
    Hint

  3.   Find the coordinates of the center of a circle with equation
x2 + y2 - 2x + 8y + 13 = 0.
    A. (1, -4) B. (1, 4)
    C. (-1, 4) D. (-1, -4)
    Hint

  4.   Write the equation in standard form.
    A. B.
    C. D.
    Hint

  5.   Which of the following could be the center of a circle that is tangent to the lines y = 3 and x = –2?
    A. (2, 1) B. (0, 0)
    C. (-3, 1) D. (2, -1)
    Hint



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