Projective Pappus

-Six points, lying alternately on two straight lines, form a hexagon whose three pairs of opposite sides meet on a line and said to be collinear.
 - Drag any of the points A,B,C,D,E, or F to see that G,H,I stay
  collinear.
 - Also gives proof to the commutative law ab = ba and a+b =b+a
- Called a projective law since only involves concepts of points, lines and meetings between them.

-Pappaus theroem states that six points lying alternativley on 2 straight lines form a hexagon whose three pairs or opposite sides meet on a line
 - Also gives proof to the commutative law ab=ba and a+b=b+a
- Called a projective law since only involves concept of points, lines and meetings between them.

Kiran gahir, March 7, 2011, Created with GeoGebra