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a circle is a circle - no sides at all
Archimedes created the formula for measuring the circumference of a circle he used many-sided polygons, both inside and out to approximate it.
a semi-circle
Zero in the normal course of events. You could say you can approximate a circle by an infinite-sided polygon, and then you would have infinite sides and corners. Or you could say a circle has an inside and an outside.
Pentagram
it has so many sides it looks like a circle.
a circle is a circle - no sides at all
a circle
A 0-sided shape is called a nullipore or vacuous shape. It is a theoretical concept in mathematics that represents a point in space with no measurable dimensions. In geometric terms, it is often referred to as a "point" or "vertex." This shape has no sides, angles, or any other defining features beyond its position in space.
Circle
There is no such thing as a 1 sided shape nor a two sided shape.
A 9-sided "circle" is an nonagon or enneagon.
Archimedes created the formula for measuring the circumference of a circle he used many-sided polygons, both inside and out to approximate it.
a polygon is a multi-sided shape, therefore a circle is not a polygon.
circle
a circle
A circle!