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      Geometric Art: Isolines or Contour Lines of Problem 1151, Circle, Diameter, Chord, Perpendicular, 90 Degrees,  
	  Parallel Lines
	      			 
							
							IsolineAn isoline or contour line of a function of two variables
										 is a curve along which the function has a constant value. Isolines usually have a parallel trend.
 
 See
				also:
 Original problem 1151
 
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