Hannah H.

asked • 05/09/16

Center of the circle

the equation (x-3)^2+(y+7)^2=49 
what is the center of the circle?
what is the length of the radius of the circle? 
Please help I don't understand how to calculate the center or radius using midpoints? 

1 Expert Answer

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Arnold F. answered • 05/09/16

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The general form of an equation of a circle is (x-h)2 + (y-k)2=r2 where the center is (h,k) and the radius is r.
 
Can you figure out the center and radius from this equation?
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Hannah H.

Is H =-3 from the equation, and K=7 from the equation? And then when I get the radius.. What is the center ?
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05/09/16

Arnold F.

If x-h = x-3 then h=3
 
If y-k  = y+7 then k=-7
 
so the center is ( 3,-7).
 
If r2 = 49 what is r?
 
 
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05/09/16

Hannah H.

7.
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05/09/16

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