circle, square, equilateral triangle, rhombus, etc.
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A sphere.
If the shape is two-dimensional then it is a circle, if the shape is three-dimensional then it's a sphere.
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 has all of it's points the same distance from the center. For example, if you put a dot on a given point on the circumference, or outline of a circle, all the points have the same distance from the circle. This only works if you put a point on the outline or circumference of the circle.
A curved surface on which all points are the same distance from the center is called a sphere.