**Recognition of Solids ICSE Class-6th** Concise Selina Mathematics Solutions Chapter-31. We provide step by step Solutions of Exercise / lesson-31 **Recognition of Solids** for **ICSE Class-6 **Concise Selina Mathematics.

Our Solutions contain all type Questions of Exe-30 with Notes on “**Recognition of Solids****”** to develop skill and confidence. Visit official Website **CISCE** for detail information about **ICSE** Board **Class-6**.

**Recognition of Solids ICSE Class-6th** Concise Selina Mathematics Solutions Chapter-31

### Exercise – 31 **Recognition of Solids ICSE Class-6th** Concise Selina Mathematics

**Question -1.**

Identify the nets which can be used to form cubes :

**Answer-1**

Nets for a cube are (ii), (iii) and (iv).

**Question- 2.**

Draw at least three different nets for making cube.

**Answer-2**

**Question -3.**

The dimensions of a cuboid are 6 cm, 4 cm and 3 cm. Draw two different types of oblique sketches for this cuboid.

**Answer-3**

**Question- 4.**

(i) an oblique sketch

(ii) an isometric sketch.

**Answer-4**

**Question -5.**

In each case, name the object.

**Answer-5**

**Question -6.**

Look at the solids, drawn below, and fill the given chart.

**Answer-6**

Polyhedon |
Faces(F) |
Vertices(V) |
Edges(E) |
F – E + V |

(a) Triangular pyramid | 4 | 4 | 6 | 2 |

(b) Square pyramid | 5 | 5 | 8 | 2 |

(c) Hexahedron | 8 | 6 | 12 | 2 |

(d) Hexagonal prism | 8 | 12 | 18 | 2 |

#### P. Q.

**Answer-PQ**

**(i)** a + 6 — 12 = 2 ⇒a = 2- 6+12 = 14-6 = 8

**(ii)** b + 5- 9 = 2 ⇒b-2 + 9-5 = 6

**(iii)** 20 + 12 – c = 2 ⇒ 32 – c = 2 ⇒ c = 32 – 2 ⇒ c = 30

**(iv)** 6 + d – 12 = 2⇒ d-6 = 2 ⇒ d = 2 + 6 = 8

#### P.Q.

Using an isometric dot paper, draw :

(i) a cube with each edge 3 cm.

(ii) a cuboid measuring 5 cm x 4 cm x 3 cm.

**Answer-PQ**

**Question- 7.**

Dice are cubes with dot or dots on each face. Opposite faces of a die always have a total of seven on them.

Below are given two nets to make dice (cube), the numbers inserted in each square indicate the number of dots in it.

Insert suitable numbers in each blank so that numbers in opposite faces of the die have a total of seven dots.

**Answer-7**

(ii)

**Question -8.**

The following figure represents nets of some solids. Name the solids.

**Answer-8**

The given nets are of the solid as given below :

**(i)** Tetrahedron

**(ii)** Triangular prism

**(iii)** Cube

**(iv)** Cuboid

–: End of** Recognition of Solids ICSE Class-6th **Solutions :–

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