St#2 Circles (Part 1)

15 Questions | Total Attempts: 13

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St#2 Circles (Part 1)

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Questions and Answers
  • 1. 
    It is the set of points in a plane whose distances from a fixed point is a constant.
    • A. 

      Circle

    • B. 

      Ellipse

    • C. 

      Hyperbola

    • D. 

      Parabola

  • 2. 
    The fixed point of the circle is called
    • A. 

      Chord

    • B. 

      Center

    • C. 

      Radius

    • D. 

      Point of tangency

  • 3. 
    The distance from the fixed point to any point on the circle is 
    • A. 

      Chord

    • B. 

      Diameter

    • C. 

      Radius

    • D. 

      Tangent line

  • 4. 
    Which is the equation of a circle in standard form whose center is the origin?
    • A. 

      X2 + y2 = r

    • B. 

      X2 + y2 = r2

    • C. 

      X2 + y2 - r = 0

    • D. 

      X2 + y2 - r2 = 0

  • 5. 
    What is the radius of the circle defined by x2 + y2 = 81?
    • A. 

      3

    • B. 

      9

    • C. 

      92

    • D. 

      81

  • 6. 
    What is the center of the circle 3x+ 3y2 = 12
    • A. 

      (0,0)

    • B. 

      (3 ,4)

    • C. 

      (-3, 4)

    • D. 

      (-3, - 4)

  • 7. 
    What is the equation of the circle?
    • A. 

      X2 + y2 = 0

    • B. 

      X2 + y2 = 3

    • C. 

      X2 + y2 = 6

    • D. 

      X2 + y2 = 9

  • 8. 
    What is the equation of the circle whose center is at the origin and radius is square root of 10
    • A. 

      X2 + y2 = 3.2

    • B. 

      X2 + y2 = 10

    • C. 

      X2 + y2 = 100

    • D. 

      10x2 + 10y2 = 10

  • 9. 
    What is the equation of the circle
    • A. 

      (x - 2)2 + (y - 1)2 = 9

    • B. 

      (x + 2)2 + (y - 1)2 = 9

    • C. 

      (x + 2)2 + (y + 1)2 = 9

    • D. 

      (x - 2)2 + (y + 1)2 = 9

  • 10. 
    What is the equation in general form of the circle whose center is (-4, 5) and radius is 4
    • A. 

      X2 + y2 - 8x +10y + 25 = 0

    • B. 

      X2 + y2 + 8x -10y + 25 = 0

    • C. 

      X2 + y2 + 8x -10y + 41 = 0

    • D. 

      X2 + y2 + 8x +10y - 41 = 0

  • 11. 
    What is the center of the circle x2 + y2 +2x - 4y = 20
    • A. 

      (1, 2)

    • B. 

      (-1 ,2)

    • C. 

      (-1, -2)

    • D. 

      (1, -2)

  • 12. 
    What is the radius of the circle x2 + y2 + 2x - 4y = 20
    • A. 

      4.5

    • B. 

      5

    • C. 

      20

    • D. 

      25

  • 13. 
    What is the equation in standard form of a circle whose center is (2, -3) and diameter is 10
    • A. 

      (x - 2)2 + (y + 3)2 = 25

    • B. 

      (x + 2)2 + (y - 3)2 = 25

    • C. 

      (x - 2)2 + (y + 3)2 = 100

    • D. 

      (x + 2)2 + (y - 3)2 = 100

  • 14. 
    What is the radius of the circle whose center is at (- 4,_1) and tangent to the x - axis
    • A. 

      1

    • B. 

      2

    • C. 

      3

    • D. 

      4

  • 15. 
    What is the general form of equation of the circle (x + 5)2 + (y - 6)2 = 4
    • A. 

      X2 + y2 + 10x + 12y + 57 = 0

    • B. 

      X2 + y2 - 10x + 12y + 57 = 0

    • C. 

      X2 + y2 + 10x - 12y -  57 = 0

    • D. 

      X2 + y2 + 10x - 12y + 57 = 0

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