**Table of Contents**Show

## Introduction

When it comes to three-dimensional figures, there are various shapes and forms that we come across in our daily lives. From cubes to rectangular prisms, each figure has its own unique characteristics and properties. In this article, we will explore the three-dimensional figure that has exactly three rectangular faces and delve into its properties, real-life applications, and more.

## What is a Three-Dimensional Figure?

A three-dimensional (3D) figure is a solid figure that has length, width, and height. These figures are often represented in geometry and are used to represent objects in the real world. Some common examples of 3D figures include cubes, spheres, cylinders, cones, and rectangular prisms.

## The Three-Dimensional Figure with Exactly Three Rectangular Faces

The 3D figure that has exactly three rectangular faces is known as a **cuboid**. A cuboid is a solid figure that has six faces, with three pairs of opposite faces being congruent rectangles. It is also known as a rectangular prism.

## Properties of a Cuboid

A cuboid has several important properties that distinguish it from other three-dimensional figures. Some of the key properties of a cuboid include:

**Rectangular Faces:**As mentioned earlier, a cuboid has six faces, out of which three are pairs of opposite faces that are congruent rectangles. These rectangular faces give the cuboid its distinct shape and structure.**Right Angles:**All the angles formed between the adjacent rectangular faces of a cuboid are right angles. This property makes the cuboid an important figure in geometry and engineering.**Edges and Vertices:**A cuboid has 12 edges and 8 vertices. The edges are where the faces of the cuboid meet, and the vertices are the points where the edges meet. These edges and vertices play a crucial role in defining the shape and structure of the cuboid.**Diagonals:**A cuboid has four space diagonals, which are line segments joining opposite vertices of the cuboid. These diagonals help in determining the diagonal distance between two points inside the cuboid, and are important in various mathematical and practical applications.**Volume and Surface Area:**The volume of a cuboid is calculated by multiplying its length, width, and height, while its surface area is calculated using the sum of the areas of all its faces. These measurements are important in various fields such as architecture, construction, and manufacturing.

## Real-Life Applications of Cuboids

The unique properties of cuboids make them a significant figure in various real-world applications. Some of the common real-life applications of cuboids include:

**Architecture:**Cuboids are commonly used in architecture and construction for designing buildings, houses, and other structures. The rectangular shape of the cuboid allows for efficient use of space and easy construction.**Packaging:**Many packaged goods such as boxes, cartons, and containers are in the shape of cuboids. This is because cuboids provide ample space for storing products and are easy to stack and transport.**Furniture:**Many pieces of furniture, such as bookshelves, cabinets, and tables, are designed with the shape of a cuboid. This allows for practical and functional use of space in interior design and home furnishings.**Mathematics and Engineering:**Cuboids are extensively used in mathematics and engineering for various calculations and designs. Their properties such as volume, surface area, and right angles make them valuable in solving mathematical problems and engineering applications.**Manufacturing:**In manufacturing industries, cuboids are used for designing and producing various products and components. Their uniform shape and structure make them ideal for manufacturing processes.

## Conclusion

In conclusion, the three-dimensional figure that has exactly three rectangular faces is the cuboid, also known as a rectangular prism. It possesses unique properties such as its rectangular faces, right angles, edges, vertices, and diagonals. The practical applications of cuboids in architecture, packaging, furniture, mathematics, engineering, and manufacturing make them a fundamental figure in our daily lives. Understanding the properties and applications of cuboids is crucial in various fields, and their significance continues to make a valuable contribution to the world around us.