Geometric Art: Isolines, Triquetra, Celtic Knotwork,
Trefoil Knot,
Parallel Lines, Geometry
for Kids, Software, iPad


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.
Parallel lines are lines in a plane which do not intersect or touch each other at any point.
Triquetra
Triquetra was used to refer to various threecornered shapes. Topologically, the interlaced form of the plain triquetra is a trefoil knot. The triquetra is often used artistically as a design element when Celtic knotwork is used.
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