名词中文翻译
中文翻译：切线
同义词：
['straight line', 'perpendicular line', 'tangent line']
例句：
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1. The circle has a radius of 5 units and a diameter of 10 units.
这个圆的半径是5单位，直径是10单位。
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2.The angle between the two sides is a right angle, which is also known as a tangent.
这两个边之间的角是一个直角，也被称为正切。
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3.The tangent to the circle at point A is perpendicular to the radius from point A.
点A处的圆的切线与从点A到圆心的半径垂直。