usepackage("ocgx2"); settings.tex="pdflatex"; size(0,150); pen colour1=red; pen colour2=green; pair z0=(0,0); pair z1=(-1,0); pair z2=(1,0); real r=1.5; path c1=circle(z1,r); path c2=circle(z2,r); begin("A"); fill(c1,colour1); end(); fill(c2,colour2); picture intersection; fill(intersection,c1,colour1+colour2); clip(intersection,c2); add(intersection); draw(c1); draw(c2); label("$A$",z1); begin("B"); label("$B$",z2); end(); pair z=(0,-2); real m=3; margin BigMargin=Margin(0,m*dot(unit(z1-z),unit(z0-z))); draw(Label("$A\cap B$",0),conj(z)--z0,Arrow,BigMargin); draw(Label("$A\cup B$",0),z--z0,Arrow,BigMargin); draw(z--z1,Arrow,Margin(0,m)); draw(z--z2,Arrow,Margin(0,m));