l_1=8;l_2=25;l_3=20;l_4=20;
xx1=[?];yy1=[?];????%左上
xx2=[?];yy2=[?];????%右上
for?i=1:100;
????x1=l_1*cos（x（i））;
????y1=l_1*sin（x（i））;
????x2=l_3*cos（y（i））+l_4;
????y2=l_3*sin（y（i））;
????xx1=[xx1x1];
????yy1=[yy1y1];
????xx2=[xx2x2];
????yy2=[yy2y2];
end

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