@options;

@figure;
  gogeometry = texte( -5.5 , -6.1 ,"Antonio Gutierrez.     www.gogeometry.com")  { rougefonce , dec1 , car-3 };
  click = texte( -5.5 , -5.7 ,"Click this button to start/stop the animation")  { rougefonce , dec2 , car-3 };
  A = point( -1.43 , -2 )  { rond2 , (-0.66,-0.06) };
  N2an = point( -1.46 , 0.78 )  { i };
  N1an = point( -2.61 , 0.98 )  { i };
  ceN2N1 = cercle( N2an , N1an )  { i };
  xx = reel( 353.5 , 0 , 360 , 2.5 )  { oscille , (7.67,-8) , i };
  var yy = 180*cos(xx)+150 { 328.842934021786 };
  B = pointsur( ceN2N1 , yy )  { rond2 , (-0.37,-0.94) };
  C = point( 4.43 , -2 )  { rond2 , (-0.23,-0.07) };
  sAB = segment( A , B )  { noir , 3 };
  sBC = segment( B , C )  { noir , 3 };
  sAC = segment( A , C )  { noir , 3 };
  polyABC = polygone( A , B , C  )  { stop , jaune , plein60 };
  bissCAB = bissectrice( C , A , B )  { i };
  bissACB = bissectrice( A , C , B )  { i };
  I = intersection( bissACB , bissCAB )  { rond1 , sansnom };
  perpIsAC = perpendiculaire( I , sAC )  { i };
  ceIE1 = cercle( I , E )  { orange , plein30 };
  ceIE = cercle( I , E )  { stop };
  E = intersection( perpIsAC , sAC )  { stop };
  F = intersection( sAB , ceIE , 0 )  { (-0.62,-0.49) };
  D = intersection( sBC , ceIE , 1 )  { stop , (0.03,-0.77) };
  sFD = segment( F , D )  { stop , vertfonce , 3 };
  sFE = segment( F , E )  { stop , vertfonce , 3 };
  sED = segment( E , D )  { stop , vertfonce , 3 };
  polyDEF = polygone( D , E , F  )  { vertclair , plein60 };
  P = pointsur( sED , 0.34 )  { i };
  G = point( 1.83 , -2.81 )  { i };
  sPG = segment( P , G )  { grisclair };
  P3 = texte( G ,"Given: Contact triangle DEF")  { stop , vertfonce , (-0.08,-0.2) , dec2 , car-3 };
  dFD = droite( F , D )  { vertfonce , 7 , sansnom };
  dAC = droite( A , C )  { noir , sansnom };
  B' = intersection( dFD , dAC )  { stop , rouge , rond3 , (-0.47,-0.8) };
  dFE = droite( F , E )  { vertfonce , 7 , sansnom };
  dBC = droite( B , C )  { noir , sansnom };
  A' = intersection( dFE , dBC )  { stop , rouge , rond3 , (-0.27,-1) };
  dED = droite( E , D )  { vertfonce , 7 , sansnom };
  dAB = droite( A , B )  { noir , sansnom };
  C' = intersection( dAB , dED )  { stop , rouge , rond3 , (-0.76,-0.53) };
  G8 = point( 2.03 , 2.77 )  { i };
  sC'G8 = segment( A' , G8 )  { grisclair };
  P8 = texte( G8 ,"A',B',C': Nobbs points")  { stop , vertfonce , (0.08,-0.52) , dec2 , car-3 };
  dA'B' = droite( A' , B' )  { rouge , 3 , sansnom };
  P9 = pointsur( dA'B' , 1.15 )  { i };
  G9 = point( -3.34 , -4.17 )  { i };
  sP9G9 = segment( P9 , G9 )  { grisclair };
  P5 = texte( G9 ,"To Prove: Gergonne line A'B'C'")  { stop , rouge , (-0.1,-0.03) , dec2 , car-1 };

@config;
couleurfonddessin=0xFFFFFF;
boutons=animation;