A 3D rectangle is called a rectangular prism.
Understanding Rectangular Prisms
A rectangular prism is a three-dimensional geometric shape. It essentially takes the two-dimensional rectangle and extends it into the third dimension, adding depth or thickness. The reference states that a rectangular prism, a four-sided object, adds a third dimension to a rectangle.
Key Characteristics of a Rectangular Prism:
- Six Faces: A rectangular prism has six faces, all of which are rectangles.
- Parallel and Equal Sides: Similar to a rectangle, the opposite sides (faces in this case) of a rectangular prism are equal and parallel.
- Right Angles: All angles in a rectangular prism are right angles (90 degrees).
Examples of Rectangular Prisms:
The reference provides a clear example: "An example of a rectangular prism is a mattress." Other common examples include:
- Boxes (cereal boxes, shipping boxes)
- Books
- Bricks
- Buildings (often, or parts of buildings)
Rectangular Prism vs. Cube
It's important to distinguish a rectangular prism from a cube. While both are three-dimensional shapes, a cube is a special type of rectangular prism where all sides are equal squares. A rectangular prism, on the other hand, can have sides of different lengths.
