RS Aggarwal Solutions For Class 8 Maths Chapter 19 Three-Dimensional Figures are provided here. You can download the pdf of RS Aggarwal Solutions for Class 8 Maths Chapter 19 Three-Dimensional Figures from the given links. Class 8 is an important phase of a studentâ€™s life. It is critical to thoroughly understand the concepts taught in Class 8 as they are continued in Class 9 and 10, while also building a foundation. Here we will learn about the Three-Dimensional Figures, their properties.

RS Aggarwal Solutions helps students to get a good score in the examinations, while also providing extensive knowledge about the subject, as Class 8 is a critical stage in their academic career. Therefore, we at BYJUâ€™S provide answers to all questions uniquely and briefly.

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### Access Answers to Maths RS Aggarwal Solutions for Class 8 Chapter 19 – Three-Dimensional Figures

## Exercise 19A

**1. Write down the number of faces of each of the following figures:**

**Cuboid****Cube****Triangular prism****Square pyramid****Tetrahedron**

**Solution:**

- A cuboid has 6 faces and face is also known as sides.The faces of cuboid are ABFE, BFGC, GHDC, HEAD, DCBA, and HGFE.
- A cube has 6 faces namely ABFE, BFGC, GHDC, HEAD, DCBA, and HGFE.
- A triangular prism has totally 5 faces in that 2 are of triangular faces and 3 are rectangular faces. Namely, ABE, ABCD, BCFE, AEFD and FDC
- Square pyramid have totally 5 faces. Square face in the base and 4 triangular faces. Namely, ABC, ACD, ABE, AED and BEDC.
- Tetrahedron is also called as triangular prism. Tetrahedron have totally 4 faces in that 1 is triangular face as base and 3 triangular faces as the sides.

**2. Write down the number of edges of each of the following figures:**

**Tetrahedron****Rectangular pyramid****Cube****Triangular prism**

**Solution:**

- Tetrahedron has six edges. Namely, OA, OB, OC, AB, AC and BC.
- Rectangular pyramid has 8 edges. Namely, AB, BC, CD, DA, OA, OB, DC and OD.
- A cube has 12 edges. Namely, AB, BC, CD, DA, EF, FG, GH, HE, AE, DH, BF, CG.
- A triangular prism has 9 edges. Namely, AB, BC, CD, DA, EF, FD, AD, BE, CF.

## Exercise 19B

**1. Define Eulerâ€™s relation between the number faces, number of edges and number of vertices for various 3-dimensional figures.**

**Solution: **

In a 3-dimensional figure, let the number of faces be F, the number of edges be E and the number of vertices be V.

Then, the Eulerâ€™s relation is given by F-E+V=2.

Shape | Faces | Vertices | Edges | F-E+V |

Cube | 6 | 8 | 12 | 2 |

octahedron | 8 | 6 | 12 | 2 |

**2. How many edges are there in a**

**Cuboid****Tetrahedron****Triangular prism****Square pyramid**

**Solution:**

- A cuboid had 12 edges. Namely, AB, BC, CD, DA, EF, FG, GH, HE, AE, DH, BF, CG.
- A tetrahedron has 6 edges. Namely, OA, OB, OC, AB, AC and BC.
- A triangular prism has 9 edges. Namely, AB, BC, CD, DA, EF, FD, AD, BE, CF.
- A square pyramid has 8 edges. Namely, AB, BC, CD, DA, OA, OB, DC, OD.

## RS Aggarwal Solutions for Class 8 Maths Chapter 19- Three-Dimensional Figures

Chapter 19, Three-Dimensional Figures, contains 2 Exercises. RS Aggarwal Solutions given here contains the answers to all the questions present in these exercises. Let us have a look at some of the concepts that are being discussed in this chapter.

- Definition of solids
- Faces, vertices and edges of a three-dimensional figures
- Cuboid
- Cube
- Prism
- Pyramid
- Square pyramid
- Rectangular pyramid
- Triangular pyramid

- Eulersâ€™s relation for Three-Dimensional Figures

### Also, Access RS Aggarwal Solutions for Class 8 Chapter 19

### Chapter Brief of RS Aggarwal Solutions for Class 8 Maths Chapter 19 – Three-Dimensional figures

The RS Aggarwal Solutions for Class 8 Maths Chapter 19 â€“ Three-Dimensional Figures deals with the definition of solids, faces, vertices and edges of a Three-Dimensional Figures such as cuboid, cube, etc, and also deals with Eulerâ€™s relation for Three-Dimensional Figures.