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Help with graphing circles

Quiz yourself by thinking what should be in each of the black spaces below before clicking on it to display the answer.
        Help!  

Question
Answer
(x-5)squared + (y+4)squared, What is the center?   (5, -4)  
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What is the radius? (x-6)squared + (y-2)squared = 9   3  
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What is the center represented as in standard form?   (h, k)  
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How do you tell the radius from standard form?   The difference between (h, k) & (x, y)  
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(x+3)squared +(y-7)squared = 4, What are the center and radius?   (-3, 7) & 4  
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(x-5)squared + (y-3)squared = 6, What are the center and radius?   (5, 3) & square root 6  
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Are you supposed to take the exact form of (h, k) or the opposites?   opposites  
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what is r represented in?   r-units  
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