Tamilnadu State Board New Syllabus Samacheer Kalvi 8th Maths Guide Pdf Chapter 2 Measurements Ex 2.3 Text Book Back Questions and Answers, Notes.

## Tamilnadu Samacheer Kalvi 8th Maths Solutions Chapter 2 Measurements Ex 2.3

Question 1.

Fill ini the blanks:

(i) The three dimensions of a cuboid are ______ , ______ and ______ .

Answer:

length, breadth, height

(ii) The meeting point of more than two edges in a polyhedron is called as ______ .

Answer:

Vertex

(iii) A cube has _________ faces.

Answer:

six

(iv) The cross section of a solid cylinder is ______ .

Answer:

circle

(v) If a net of a 3-D shape has six plane squares, then it is called ______ .

Answer:

cube

Question 2.

Match the following

Answer:

(i) – b

(ii) – a

(iii) – d

(iv) – c

Question 3.

Which 3 – D shapes do the following nets represents? Draw them.

(i)

Answer:

The net represents cube, because it has 6 squares.

(ii)

Answer:

The net represents cuboid

(iii)

Answer:

The net represents Triangular prism

(iv)

The net represents square pyramid

(v)

Answer:

Ine net represents cylinder

Question 4.

For each solid, three views are given. Identify for each solid, the corresponding Top, Front and Side (T, F and S) views.

Answer:

Question 5.

Verify Euler’s formula for the table given below.

Answer:

Euler’s formula is given by F + V – E = 2

(i) F = 4; V = 4; E = 6

F + V – E = 4 + 4 – 6 = 8 – 6

F + V – E = 2

∴ Euler’s formula is satisfied.

(ii) F = 10; V = 6; E = 12

F + V – E = 10 + 6 – 12 = 16 – 12 = 4 ≠ 2

∴ Euler’s formula is not satisfied.

(iii) F = 12; V = 20; E = 30

F + V – E = 12 + 20 – 30 = 32 – 30 = 2

∴Euler’s formula is satisfied.

(iv) F = 20; V = 13; E = 30

F + V – E = 20 + 13 – 30 = 33 – 30 = 3 ≠ 2

∴Euler’s formula is not satisfied.

(v) F = 32; V = 60; E = 90

F + V – E = 32 + 60 – 90 = 92 – 90 = 2

∴ Euler’s formula is satisfied.