Understanding Three-Dimensional Objects
Three-dimensional (3D) objects have depth, width, and height, making them more complex than two-dimensional (2D) shapes, which only have length and width.
Types of Shapes
- Square:
- A square is a 2D shape with four equal sides and four right angles.
- It exists only on a flat surface.
- Triangle:
- A triangle is also a 2D shape with three sides and three angles.
- Like a square, it is flat and does not have depth.
- Circle:
- A circle is a round, 2D shape characterized by all points being equidistant from the center.
- It also lacks height and depth.
- Cube:
- A cube is a 3D object with six square faces, twelve edges, and eight vertices.
- It has depth, width, and height, making it a solid object.
Why Cube is the Correct Answer
The cube is the only option listed that meets the criteria of being a three-dimensional object. It can be visualized as a box that occupies space and can be measured in three dimensions (length, width, height).
In contrast, the square, triangle, and circle are flat shapes, confined to two dimensions.
Conclusion
In summary, while squares, triangles, and circles are two-dimensional, the cube stands out as the sole three-dimensional shape among the options provided. Understanding these differences is crucial in geometry and helps in visualizing how objects exist in space.

A cube is a three-dimensional object with equal sides and angles in all directions, while the other shapes are two-dimensional.