FTCE General Knowledge Math Practice Test

What kind of figure is defined as a simple, closed two-dimensional shape?

1. Circle

2. Polygon

3. Ellipsoid

4. Ellipse

The correct answer is: Polygon

The definition of a simple, closed two-dimensional shape aligns perfectly with the concept of a polygon. A polygon is formed by connecting a finite number of line segments end to end, creating a closed figure that has no overlaps or intersections. This definition encompasses various shapes, such as triangles, squares, and pentagons, all of which meet the criteria of being simple and closed. In contrast, circles and ellipses, while they are also two-dimensional shapes, are classified differently. A circle is defined by all points being equidistant from a center point, which does not involve straight line segments. An ellipsoid, meanwhile, refers to a three-dimensional object, so it wouldn't fit within the definition of a two-dimensional shape. Therefore, acknowledging these distinctions reinforces that a polygon is indeed the correct categorization for a simple, closed two-dimensional figure.