Thus in geometry you are told to conceive the circumference of a circle as formed of an infinite number of infinitely small straight lines.
譬如，在几何学里我们必须假定，一个圆周的圈线是由无限多喝无限小的直线形成的。
The circle-power theorem is one of important theorems in plane geometry.
圆幂定理是初中平面几何《圆》中重要定理之一。
The circle-power theorem is one of important theorems in plane geometry.
圆幂定理是初中平面几何《圆》中重要定理之一。
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