圆规的美丽，在于角度的完美。
The beauty of the compasses, lie in the perfection of the Angle.
板面上带有三角尺的量角器(3)通过弹性固定卡(7)固定在圆规的上部两侧。
The protractor (3) with a triangular rule is arranged on a board and is fixed on the two sides on the upper part of the compasses through an elastic fixing clip (7).
使用长腿圆规或电子测量系统测量各对角的抬起点，然后比较其是否对称。
Measure pickup points diagonally using a beam compass or an electronic measuring system and compare the symmetry.
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