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      Transversal Line, Theorems and 
		Problems - Table of Content 5 |  
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		Six Tangential or Circumscribed Quadrilaterals Theorem. |  
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		Geometry Problem 324.Quadrilateral with perpendicular diagonals, Concurrence.
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		Geometry Problem 320.Triangle, Circumcircle, Incenter, Excenter, Collinear points.
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		Geometry Problem 319.Triangle, Altitudes, Perpendiculars, Collinear points.
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		Geometry Problem 318.A Scalene triangle, Altitudes, Collinear points.
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		Geometry Problem 286: Square, Midpoints, Octagon.  |  
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		Geometry Problem 239. Square, Midpoints, Lines, Congruence, 
		Pythagoras. 
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		Geometry Problem 238. Square, Midpoints, Lines, Congruence. 
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		Geometry Problem 237. Quadrilateral, Midpoints, Exterior line, 
		Perpendicular lines. 
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		Geometry Problem 236. Quadrilateral, Midpoints, Exterior line, 
		Perpendicular lines. 
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		Geometry Problem 235. Parallelogram, Transversal line, Perpendicular 
		lines.  
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