圆心;
Any line drawn through the center of a circle is normal to the circumference.
通过圆心画的任何直线均垂直于圆周线.
A diameter passes through the center of a circle.
直径从圆心穿过.
Find the center of a circle with the circumference given.
[给定一圆周以圆规作图找出圆心].
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