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+import graph3;
+import solids;
+size(0,150);
+currentprojection=perspective(0,1,10,up=Y);
+
+real f(real x) {return sqrt(x);}
+pair F(real x) {return (x,f(x));}
+triple F3(real x) {return (x,f(x),0);}
+
+path p=graph(F,0,1,n=25,operator ..);
+path3 p3=path3(p);
+
+revolution a=revolution(p3,Y,0,360);
+draw(surface(a),green);
+draw(p3,blue);
+
+xtick((0,0,0));
+xtick((1,0,0));
+
+xaxis3(Label("$x$",1),Arrow3);
+yaxis3(Label("$y$",1),ymax=1.5,dashed,Arrow3);
+dot(Label("$(1,1)$"),(1,1,0));
+arrow("$y=\sqrt{x}$",F3(0.5),X,0.75cm,red);
+draw(arc(1.2Y,0.3,90,0,7.5,140),Arrow3);