For the holes measurements, this method randomly finds four right triangles from the four quadrants in a circle, and then computes the circle diameter using the Pythagorean theorem.

• 而在圆孔的量测上，以随机方式求得分布于圆孔四个象限的四组直角三角形，利用毕氏定理求出其圆孔之直径尺寸。