1.   Write the standard form of the equation of the circle that is tangent to the y-axis and has its center at (5, 3).
    A. (x 5)2 + (y + 3)2 = 5
    B. (x 5)2 + (y + 3)2 = 25
    C. (x + 5)2 + (y 3)2 = 5
    D. (x + 5)2 + (y 3)2 = 25
    Hint

  2.   Write the general form of the equation of the circle that passes through the points at (4, 2), (3, 1), and (2, 6).
    A. x2 + y2 + 2x + 4y 20 = 0
    B. x2 + y2 + 2x 4y 20 = 0
    C. x2 + y2 2x 4y + 20 = 0
    D. x2 + y2 2x + 4y 20 = 0
    Hint

  3.   Write the equation of the circle whose diameter has endpoints at (3, 1) and (9, 5).
    A. (x + 3)2 + (y 2)2 = 13
    B. (x 3)2 + (y + 2)2 = 13
    C. (x 3)2 + (y + 2)2 = 45
    D. (x + 3)2 + (y 2)2 = 45
    Hint

  4.   Write the equation of a circle that has a diameter with endpoints at (1, 0) and (5, 4).
    A. (x + 3) 2 + (y + 2) 2 = 8
    B. (x - 3) 2 + (y - 2) 2 = 8
    C. (x - 3) 2 + (y - 2) 2 = 64
    D. (x + 3) 2 + (y - 2) 2 = 64
    Hint

  5.   The equation of a circle is (x - 8) 2 + (y + 3)2 = 48, find the center and the radius.
    A. (-8, -3); B. (8, 3);
    C. (8, -3); D. (-8, 3);
    Hint