# NCERT Solutions for Class 8 Maths Chapter 10 Exercise 10.1

NCERT Solutions for Class 8 Maths Chapter 10 Exercise 10.1 (Ex. 10.1) Visualising Solid Shapes updated for academic session 2021-2022 free to use online or download in PDF. Question answers and solutions are given in PDF file format as well as Videos format free to use of download.

8th Maths exercise 10.1 Hindi Medium and English Medium solutions are given separately. Explanation video specify how to solve the questions whereas solution video explain the solution.

## Class 8 Maths Chapter 10 Exercise 10.1 Solution

Class: 8 | Mathematics |

Chapter: 10 | Visualising Solid Shapes |

Exercise: 10.1 | Hindi & English Medium Solutions |

### CBSE NCERT Class 8 Maths Chapter 10 Exercise 10.1 Solution in Hindi and English Medium

### Class 8 Maths Chapter 10 Exercise 10.1 Solution in Videos

#### Solids:

Objects having fixed shape and size, and occupying fixed space are called solids. Solids occur in various geometrical shapes. These shapes are known as 3- dimensional figures.

###### Faces, Vertices and Edges of a 3-dimensional Figure:

##### (i) Faces

Each flat part of a solid is called its face.

##### (ii) Vertices

Each corner where three faces of a solid meet is called its vertex. The plural of vertex is vertices.

##### (iii) Edges

The two faces of a solid meet in a line, called an edge.

###### Note: Now, we shall discuss about the faces, vertices and edges of some 3-dimensional figures having flat faces.

#### l. CUBOID:

A solid bounded by six rectangular plane faces is called a cuboid. A box, a matchbox, a book, a brick, a tile, etc., are all in the shape of a cuboid. In the adjoining figure, ABCDEFGH is a cuboid.

##### (i) Faced of a cuboid:

A cuboid has 6 faces. In the given figure, the 6 faces of the cuboid are: ABCD, EFGH, ADHE, BCGF, ABFE and DCGH.

##### (ii) Vertices of a cuboid:

A cuboid has 8 vertices. In the given figure, the 8 vertices of the cuboid are: A, B, C, D, E, F, G, H.

##### (iii) Edges of a cuboid:

A cuboid has 12 edges. In the given figure, the 12 edges of the cuboid are: AB, BC, CD, DA, EF, FG, GH, HE, AE, DH, BF, CG.

##### How many face does a cuboid has?

In the case of a cuboid this gives 6 + 8 = 12 + 2; that is, like a cube, a cuboid has 6 faces, 8 vertices, and 12 edges. Along with the rectangular cuboids, any parallelepiped is a cuboid of this type, as is a square frustum (the shape formed by truncation of the apex of a square pyramid).

##### What is special about a cuboid?

A cuboid is a box-shaped object. It has six flat faces and all angles are right angles. And all of its faces are rectangles. It is also a prism because it has the same cross-section along a length.

##### What is a diagonal of a cuboid?

Diagonal of a cuboid = Square root of the sum of the squares of its sides (length, breadth and height).

##### How many planes are there in any cuboid?

a cuboid should have 3 planes of symmetry. Whenever it’s cut along any of the 3 surfaces shown here…. we’ll get 2 equal and symmetric parts.