
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:
x^{2} + y^{2} = 144? 



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


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:



4. 
What choice could be the equation of the circle shown below?
Choose:



5. 
Which of the following statements is NOT true for the circle seen in the graph? 


6. 
Write the equation of a circle with a center at (0,0) and a radius of 9.



7. 
Write the equation of a circle with center at (5,2) and a radius of 7. 


8. 
What are the coordinates of the center of this circle?
(x + 6)^{2} + (y  8)^{2} = 225



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