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- as angle values have an unlimited range, the flattened circle is a theoretically unlimited line.
Wiki Markup each angle (from \[0°,360°\]) on the circle has an unlimited number of representations: _angle + X * 360°, X being an integer_- to define arcs on a circle, it is important that the difference between end and start angle is smaller than 360°: |end-angle - start-angle| < 360° (else the result would be an arc that is greater than or equal to 360° and looks like a circle)
- computing the length of an arc can be performed as follows: |startAngle – endAngle|/180° * radius * pi - the definition conforms to this formula
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