而采用直角三角形法、换面法和旋转法求出一般位置直线的实长对于提高工作效率和数据的准确度有着重要的意义。
The essay recommends three ways of assessing the substantial length of straight line in average positions, which turned out significance in improving efficiency and precision of data.
提出了在直角坐标系中用多段直线拟合曲线的方法，在极坐标系中用多段阿基米德螺线拟合曲线的方法。
In cartesian coordinates, segments of straight line are used to fit a given curve and in polar coordinates segments of Archimedes helix are used.
直角三角形的斜边不是直线-是两条线组成的。
Hypotenuse of the composite triangle is actually not a straight line - it is made of two lines.
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