File:Lc dy.png福建省連江縣東引鄉。 English: Dongyin, Lienchiang, Fujian/Fukien, Taiwan (ROC) KaurJmeb繪製。designed by User:KaurJmeb English
File:Dyson rings donut.PNGoy=sin(p)*b; #declare dx=-sin(p)*a; #declare dy=cos(p)*b; #declare l=l-dx*oy+dy*ox; #declare n=sqrt(dx*dx+dy*dy); #end //Calculate whole area under ellipse