Two.
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All four angles must be 90 degrees and the two parallel sides must have different dimension from the other two.
Considering it mathematically string is nothing but a line... So it only has one dimension that is length.. considering it physically.. It is nothing but a metal ROD.. with a given Diameter so it has three degrees of freedom hence it is a 3D structure..
A circle on it's own has 3 degrees of freedom. One being the radius/diameter of the circle and the remaining two being the X and Y coordinates of the midpoint.and.....I LIKE APPLES For futher inquiry Feature Degrees of freedom Circle 3 Line 4 Circular Arc 5 Ellipse 5 Elliptical Arc 7
Two dimensions of length: [L2]
720 degrees.