Some possible answers: a sphere, a cone, a cylinder, a ellipsoid (end-on), a spiral (like fusili) are some examples.
circle
It's probably a circle, because some people view it as a 0 sided figure, but some people view it as a 1 sided figure.
One possibility is a closed shape: a circle, ellipse, a closed wriggly shape.
A circle
A circle !!!!!!
circle
A semi-circle is a two dimensional figure so it can have area but NOT volume. To find the area of a semi-circle see the question below.
It's probably a circle, because some people view it as a 0 sided figure, but some people view it as a 1 sided figure.
A circle.
because if it had 4 straight lines instead, we would call it a rectangle.
A zero sided shape technically isn't a shape. The definition of a shape is a closed figure with at least one points evenly going to another point. A circle is the figure with the least amount of sides because it has one side, which is considered the circumference of the circle.
A shape cannot have only one side because it would not be closed. A shape must have at least three sides to be a closed figure (no "gaps")
One possibility is a closed shape: a circle, ellipse, a closed wriggly shape.
A circle
A shape that when you draw a line on the shape and cut along the line you get two identical shapes. A circle is an example.
It is called perimeter.
A sphere as a polygon is a shape with three or more sides and a sphere has no sides