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Geometric Art: Isolines or Contour Lines of Problem 1150, Circle, Perpendicular Secants, 90 Degrees,
Parallel Lines
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![Isolines of Problem 1150, Circle, Perpendicular Secants, 90 Degrees, Parallel Lines](p1150-isolines-circle-secant-90-degrees-perpendicular-congruence-7.jpg)
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Isoline
An 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 1150
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