@options;

@figure;
  A = point( -1.68 , 4.57 )  { (-0.33,-0.77) };
  B = point( -6.1 , -3.53 )  { (-0.53,-0.13) };
  C = point( 6.08 , -3.53 )  { (0.07,-0.1) };
  sAB = segment( A , B );
  sBC = segment( B , C );
  sCA = segment( C , A );
  medsAB = mediatrice( sAB )  { i };
  medsBC = mediatrice( sBC )  { i };
  medsCA = mediatrice( sCA )  { i };
  O' = intersection( medsCA , medsAB )  { i };
  O = pointaimante( -1.32 , -0.63 , O sur O'_10% );
  sOA = segment( O , A )  { 7 };
  sOB = segment( O , B )  { 7 };
  sOC = segment( O , C )  { 7 };
  var a =AO { 5.21291132136779 };
  var b =BO { 5.59204395150428 };
  var c =CO { 7.94640397356635 };
  I = milieu( sOA )  { i };
  J = milieu( sOB )  { i };
  K = milieu( sOC )  { i };
  texte1 = texte( I , "$a$ cm")  { rouge , dec2 , gras };
  texte3 = texte( K , "$c$ cm")  { rouge , dec2 , gras };
  texte2 = texte( J , "$b$ cm")  { rouge , dec2 , gras };
  var t =OO' { 1.62636098298743 };
  varsi z =[OO'<0.01,1,0] { 0 };
  varsi z' =[OO'<0.01,"noir-7-v","i"] { i };
  H = point( 2 , 7 )  { i };
  texte4 = µ(z) texte( H , "GAGNE !")  { vertfonce , dec2 , car+4 , gras };
  circ = cercle( O' , A )  {$z'$ , noir , 7 , i };