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Mathematics
A circle in the xy-plane has its center at (-100,221) and a diameter of 17. Which of the following is an equation of the circle?
A.(x+100)2+(y-221)2=72.25
B.(x+100)2+(y-221)2=289
C.(x-100)2+(y+221)2=72.25
D.(x-100)2+(y+221)2=289
n. 圈子，圆周，循环
v. 环绕，盘旋，包围
