<![CDATA[Pappus theorem is a theorem that shows collinearity of three points. The three points are the result of intersection lines that connects any six points. Any six points are divided into three points on a straight line and three points on another straight line. This paper shows that Pappus theorem is valid at a conic section (ellips, parabola and hyperbola). The properties of cross ratio are utilized to prove the validity of Pappus at the conic section.]]>
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