## RS Aggarwal Class 8 Solutions Chapter 19 Three-Dimensional Figures Ex 19B

These Solutions are part of RS Aggarwal Solutions Class 8. Here we have given RS Aggarwal Solutions Class 8 Chapter 19 Three-Dimensional Figures Ex 19B.

**Other Exercises**

- RS Aggarwal Solutions Class 8 Chapter 19 Three-Dimensional Figures Ex 19A
- RS Aggarwal Solutions Class 8 Chapter 19 Three-Dimensional Figures Ex 19B

**Question 1.**

**Solution:**

Euler’s Relation

= F – E + V = 2

Where F is no. of faces

E is no. of edges

V is no. of vertices

**Question 2.**

**Solution:**

Edges of

(i) Cuboid are 12

(ii) Tetrahedron are 6

(iii) Triangular prism are 9

(iv) Square pyramid are – 8

**Question 3.**

**Solution:**

Faces of

(i) Cube are 6

(ii) Pentagonal prism are 7 (5 + 2)

(iii) Tetrahedron are 4

(iv) Pentagonal pyramid are 6

**Question 4.**

**Solution:**

Vertices of

(i) Cuboid are 8

(ii) Tetrahedron are 4

(iii) Pentagonal prism are 10

(iv) Square pyramid are 5

**Question 5.**

**Solution:**

(i) A cube

F – E + V = 2

=> 6 – 12 + 8 = 2

=> 14 – 12 = 2

=> 2 = 2

(ii) A tetrahedron

F – E + V = 2

=> 4 – 6 + 4 = 2

=> 8 – 6 = 2

=> 2 = 2

(iii) A triangular prism

F – E + V = 2

=> 5 – 9 + 6 = 2

=> 11 – 9

=> 2 = 2

(iv) A square pyramid

F – E + V = 2

=> 5 – 8 + 5 = 2

=> 10 – 8 = 2

=> 2 = 2

Hope given RS Aggarwal Solutions Class 8 Chapter 19 Three-Dimensional Figures Ex 19B are helpful to complete your math homework.

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