名词
中文翻译：Unknown
同义词：
['pi', 'circumference', 'radius', 'circumference ratio']
例句：
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1. 圆周率
π
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1. The length of a circle's diameter is equal to its circumference.
圆的直径的长度等于其周长。
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2. The radius of the circle is half of its circumference.
圆的半径是其周长的一半。
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3. The ratio of the circumference to the diameter is pi.
圆的周长与直径的比值是π。