Circumference and the formula for circumference is C=πd or C=2rd
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The outside of the circle is always the same distance from the centre. The outside of an ellipse is not the same distance from the centre all the way round.
a cylinder is a cone with a circle at the bottom and a wrapping
The shape of a circle is round. Circles are plane shapes that have all points that are the same distance from the center.
A circle is a round figure with all points equidistant from the center. Radii of equal length is the main defining characteristic of a circle.
The triangle that has all three vertices touching the circle is called an 'inscribed triangle.' The circle has no special name, only the polygon inscribed.