Selina Solutions for Class 8, maths Chapter 19

Class 8: Maths Chapter 19 solutions. Complete Class 8 Maths Chapter 19 Notes.

Contents

1 Selina Class 8 ICSE Solutions Mathematics : Chapter 19- Representing 3-D in 2-D
- 1.1 Exercise 19
2 Download PDF
3 Chapterwise Selina Publishers ICSE Solutions for Class 8 Mathematics :
4 About Selina Publishers ICSE

Selina Class 8 ICSE Solutions Mathematics : Chapter 19- Representing 3-D in 2-D

Selina 8th Maths Chapter 19, Class 8 Maths Chapter 19 solutions

Exercise 19

Question 1.
If a polyhedron has 8 faces and 8 vertices, find the number of edges in it.
Solution:

Question 2.
If a polyhedron has 10 vertices and 7 faces, find the number of edges in it.
Solution:

Question 3.
State, the number of faces, number of vertices and number of edges of:
(i) a pentagonal pyramid
(ii) a hexagonal prism
Solution:

Question 4.
Verily Euler’s formula for the following three dimensional figures:

Solution:

Question 5.
Can a polyhedron have 8 faces, 26 edges and 16 vertices?
Solution:

Question 6.
Can a polyhedron have:
(i) 3 triangles only ?
(ii) 4 triangles only ?
(iii) a square and four triangles ?
Solution:

Question 7.
Using Euler’s formula, find the values of x, y, z.

Solution:

Question 8.
What is the least number of planes that can enclose a solid? What is the name of the solid.
Solution:

Question 9.
Is a square prism same as a cube?
Solution:

Question 10.
A cubical box is 6 cm x 4 cm x 2 cm. Draw two different nets of it.
Solution:

Question 11.
Dice are cubes where the sum of the numbers on the opposite faces is 7. Find the missing numbers a, b and c.

Solution:

Question 12.
Name the polyhedron that can be made by folding each of the following nets:

Solution:

Question 13.
Draw nets for the following polyhedrons:

Solution:

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Selina Class 8 ICSE Solutions Mathematics : Chapter 1- Rational Numbers

Download PDF: Selina Class 8 ICSE Solutions Mathematics : Chapter 1- Rational Numbers PDF

Chapterwise Selina Publishers ICSE Solutions for Class 8 Mathematics :

About Selina Publishers ICSE

Selina Publishers has been serving the students since 1976 and is one of the quality ICSE school textbooks publication houses. Mathematics and Science books for classes 6-10 form the core of our business, apart from certain English and Hindi literature as well as a few primary books. All these books are based upon the syllabus published by the Council for the I.C.S.E. Examinations, New Delhi. The textbooks are composed by a panel of subject experts and vetted by teachers practising in ICSE schools all over the country. Continuous efforts are made in complying with the standards and ensuring lucidity and clarity in content, which makes them stand tall in the industry.