Square root
(1) \begin{align} \label{eq:poly} d_n=$\sqrt{a_n^2+b_n^2} \end{align} {align}을 안써주면 줄바꿈이 일어난다. 줄바꿈 내용 참조(align, align*, &) http://cubequest.org/xe/index.php?document_srl=165972&mid=LaTex
Arc
draw (x,y) arc (start:stop:radius) with radius: radius starts from: (x,y) with center: (x-r*cos(start), y-r*sin(start)) ends: (x-r*cos(start)+r*cos(stop), y-r*sin(start)+r*sin(stop)) $\theta_1$…