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Output display by slide


a=3; b=2.5;  c=2 ;
(*  Given triangle vertices are {(0,0),(x1,y1),(x2,y2)} = { (0,0),(a,0),(b,c) } to find CG  *)
v1=Graphics[Circle[{0,0},{.03,.03}]];v2=Graphics[Circle[{a,0},{.03,.03}]];v3=Graphics[Circle[{b,c},{.03,.03}]]; 
x1=a;y1=0;x2=b;y2=c; {XF,YF}={x1+x2, y1+y2}/3;
CG=Graphics[Disk[{XF,YF},{.05,.05} ]];
Triang=Graphics[Line[{{0,0},{a,0},{b,c},{0,0},{XF,YF},{a,0},{XF,YF},{b,c},{XF,YF},{0,0}}] ] ;
bb=Show[{v1,v2,v3,Triang,CG},GridLines->Automatic,Axes-> True ,AspectRatio-> Automatic, PlotLabel-> "Centre of Gravity"] 

How  to vary b value in a SlideView or Manipulate, say between 0 to 4, (along horizontal line y =2) to display Centre of Gravity  like it is in GSP or in Java mode ?  

TIA,
Narasimham



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