Every line of constant longitude joins the north and south poles.
Therefore the length of every line of constant longitude is one half of the earth's polar circumference.
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Yes they are equal in length
A square has four sides of equal length!
A square (a by a) and a rectangle (a by b) can have sides that are of equal length.
An isosceles triangle has 2 sides of equal length. The other two types are scalene (with no sides of equal length) and equilateral (with all sides equal in length)
A polygon with sides of equal length and equal angles is termed a regular polygon.