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Desargues' Theorem is an important theorem to Projective Geometry, whereas Projective Geometry is an important component to Advanced Geometry. Desargues' Theorem is the foundation of many theorems and proposition, including the basic proposition of Advanced Geometry. The main focuses of Desargues' Theorem are the collinear of three dots or three lines sharing one point, which are frequently encountered in problems of Elementary Geometry. This article captures the essence of the Desargues' Theorem, introduces its application in Elementary Geometry, connects Advanced and Elementary Geometry, and exhibits the ingenious flexible application of Advanced Geometry in solving problems in Elementary Geometry. Thus signify the guidance significance of Advanced Geometry to Elementary Geometry.
