Practice Page
Directions: The following question pertain to the graphing of quadratic relations which are circles. Choose the best answer.

1.
What is the radius of a circle whose equation is:
x2 + y2 = 144?
circleman
       Choose:
 
8
12 16 24




2.
Which of the following equations could describe the relation seen in the graph at the right? (Check all that apply!)
 
x2 = 16 - y2

x2 + y2 = 4

x2 = 4 - y2

x2 + y2 = 16

x2 + y2 - 16 = 0

x2 + y2 - 4 = 0

        
circlegraphprac2
Center is at the origin.




3.
Which of the following points lies on a circle with equation:
(x - 1)2 + (y + 2)2 = 5?

Choose:
(3,4)
 (2,2) (3,-1) (1,-2)
circleyellow




4.
What choice could be the equation of the circle shown below?
Choose:
  (x - 1)2 + (y - 2)2 = 3 circlegraphprac4
  (x + 2)2 + (y - 1)2 = 3
  (x - 1)2 + (y + 2)2 = 9
  (x + 2)2 + (y - 1)2 = 9
   




5.
Which of the following statements is NOT true for the circle seen in the graph?
       Choose:
  The center is at the origin. circlegraphprac5
  The radius is 3.
  The equation is x2 + y2 = 3.
  The point pointcircleis on the circle.
   


 

6.
Write the equation of a circle with a center at (0,0) and a radius of 9.
       Choose:
 
x2 + y2 = 9
x2 + y2 = 81
  x2 - y2 = 9 x2 - y2 = 81


 

7.
Write the equation of a circle with center at (5,2) and a radius of 7.
       Choose:
  (x + 2)2 + (y + 5)2 = 49 teacher
  (x - 2)2 + (y - 5)2 = 49
  (x - 5)2 + (y - 2)2 = 49
  (x + 5)2 + (y + 2)2 = 49
   

 

 

8.
What are the coordinates of the center of this circle?
(x + 6)2 + (y - 8)2 = 225
       Choose:
  (6,8) (-6,8) (6,-8) (8,-6)  

 


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