评论
打印
答案：B
解析：
The formula for a circle with a center at (h,k) and a radius of r is: (x-h)2+(y-k)2=r2
The length of the radius is half of the length of the diameter.
1/2*17=8.5
Using the coordinates of the center and the length of the radius of this circle in the equation yields: (x-(-100))2+(y-221)2=8.52
In standard form, the equation of this circle is: (x+100)2+(y-221)2=72.25
