A circle or a sphere
A circle is not a plane shape. A circle is round a plane is not. A plane has parts that are similar to a circle shape.
It is a circle or a sphere
It is a round plane figure whose boundary (the circumference) consists of points equidistant from a fixed point (the center).
The distance round a closed figure is the perimeter.
a closed, flat figure is a polygon. But it is only a polygon when it is not round.
because if it had 4 straight lines instead, we would call it a rectangle.
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
It is called a great circle and the plane that circle makes must pass through the geometric center of the globe. The largest circle that can be drawn round the Earth is the great circle round its middle, the "equator" this is because the spinning of the earth makes it 'fatter' round the middle.
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.
A circle or a sphere