http://woodgears.ca/eyeball/
分数越低水平越高
下面是提示语翻译:
Adjust to make a parallelogram 调整使之成为平行四边形
Find the mid-point of the line segment 找到此线段的中点
Bisect the angle 平分这个角(找到角平分线)
Mark the point equidistant to the edges 标记出到各边距离相等的点(找到内切圆圆心)
Mark the center of the circle 标记出圆心
Make a right angle 做个直角
Find the point of convergence 找到交汇点