One way would be to count them. That may not be a realistic proposition if you have something like a start of a fractal, though!
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With a regular polygon: 360/exterior angle = number of sides
Technically, a polygon can have an unlimited number of sides.
Exterior angle regular polygon = 360° ÷ number of sides = 360° ÷ W Interior angle regular polygon = 180° - exterior angle regular polygon = 180° - (360° ÷ number of sides ) = 180° - (360° ÷ W)
There is no limit to the number of sides that a polygon can have. Mathematically, a circle is equivalent to a polygon with an infinite number of sides.
It depends on the type of polygon; for example: if the polygon is a parallelogram; the number of sides is 4