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% --- start of displayed preamble in the book ---
input metaobj
% Circles produced as before
% --- end of displayed preamble in the book ---
newCircle.a(btex start etex);
newCircle.b(btex end etex);
a.c=origin;
b.c-a.c=(3cm,1cm);
defaultfont:="ptmr8r";
warningcheck:=0;
beginfig(1)
ncdiagg(a)(b) "angleA(90)", "angleB(50)",
"linecolor(blue)","linewidth(1pt)",
"armA(3cm)";
drawObj(a,b);
endfig;
end;
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