作图

This construction is often called the parallelogram law of addition of vectors.

这种作图法常被称为矢量相加的平行四边形法则。

The stereographic projection must be supplemented by other constructions.

赤平极射投影还要有其他的作图方法加以补充。

Gibbs suggested the use of an equilateraltriangle plot, and this has become standard for ternary systems.

吉布斯提出用等边三角形作图， 这已成为三元体系的标准方法。

Find the center of a circle with the circumference given.

[给定一圆周以圆规作图找出圆心]。

So it can be used for mapping method into the text.

因此可以用作图的方法导入课文。