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+verbatimtex
+\documentclass{article}
+\begin{document}
+
+%input featpost3Dplus2D;
+etex
+beginfig(1);
+ cartaxes(1,1,1);
+endfig;
+f := (5,3.5,1);
+beginfig(2);
+ cartaxes(1,1,1);
+ color va, vb, vc, vd;
+ va = (0.29,0.7,1.0);
+ vb = (X(va),Y(va),0);
+ vc = N((-Y(va),X(va),0));
+ vd = (0,Y(vc),0);
+ drawarrow rp(black)--rp(va);
+ draw rp(black)--rp(vb)--rp(va) dashed evenly;
+ draw rp(vc)--rp(vd) dashed evenly;
+ drawarrow rp(black)--rp(vc);
+ squareangline( va, vc, black, 0.15 );
+ angline( va, red, black, 0.75, decimal getangle( va, red ), lft );
+endfig;
+verbatimtex
+\end{document}
+etex
+end;