# Selina solutions for Concise Mathematics Class 7 ICSE chapter 18 - Recognition of Solids (Representing 3-D in 2-D) [Latest edition]

#### Chapters ## Chapter 18: Recognition of Solids (Representing 3-D in 2-D)

Exercise 18
Exercise 18

### Selina solutions for Concise Mathematics Class 7 ICSE Chapter 18 Recognition of Solids (Representing 3-D in 2-D) Exercise 18

Exercise 18 | Q 1.1

Identify if the following net can be used to form a cube: • Yes

• No

Exercise 18 | Q 1.2

Identify if the following net can be used to form a cube: • Yes

• No

Exercise 18 | Q 1.3

Identify if the following net can be used to form a cube: • Yes

• No

Exercise 18 | Q 1.4

Identify if the following net can be used to form a cube: • Yes

• No

Exercise 18 | Q 1.5

Identify if the following net can be used to form a cube: • Yes

• No

Exercise 18 | Q 2

Draw at least three different nets for making a cube.

Exercise 18 | Q 3.1

The figure, given below, shows shadows of some 3D object when seen under the lamp of an overhead projector: A square

In this case, name the object.

Exercise 18 | Q 3.2

The figure, given below, shows shadows of some 3D object when seen under the lamp of an overhead projector: A rectangle

In this case, name the object.

Exercise 18 | Q 3.3

The figure, given below, shows shadows of some 3D object when seen under the lamp of an overhead projector: A triangle

In this case, name the object.

Exercise 18 | Q 4

Using Euler’s formula, find the values of a, b, c and d.

 Faces a 5 20 6 Vertices 6 b 12 d Edges 12 9 c 12
Exercise 18 | Q 5.1

Dice are cubes with dots or dots on the face. Opposite faces of a die always have a total of seven on them.
In the given below net to make dice (cube), the numbers inserted in the square indicate the number of dots in it. Insert suitable numbers in the blank so that numbers in opposite faces of the die have a total of seven dots.

Exercise 18 | Q 5.2

Dice are cubes with dots or dots on the face. Opposite faces of a die always have a total of seven on them.
In the given below net to make dice (cube), the numbers inserted in the square indicate the number of dots in it. Insert suitable numbers in the blank so that numbers in opposite faces of the die have a total of seven dots.

Exercise 18 | Q 6.1

The following figure represent the nets of some solid. Name the solid Exercise 18 | Q 6.2

The following figure represent the nets of some solid. Name the solid Exercise 18 | Q 7

Draw a map of your classroom using proper scale and symbols for different objects.

Exercise 18 | Q 8

Draw a map of your school compound using proper scale and symbols for various features like a playground, main building, garden, etc.

Exercise 18 | Q 9

In the map of India, the distance between the two cities is 13.8 cm.
Taking scale: 1 cm = 12 km, find the actual distance between these two cities.

## Chapter 18: Recognition of Solids (Representing 3-D in 2-D)

Exercise 18 ## Selina solutions for Concise Mathematics Class 7 ICSE chapter 18 - Recognition of Solids (Representing 3-D in 2-D)

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Concepts covered in Concise Mathematics Class 7 ICSE chapter 18 Recognition of Solids (Representing 3-D in 2-D) are Concept of Recognition of Solids, Concept for Mapping the Space Around Approximately Through Visual Estimation., Faces, Edges and Vertices.

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