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

Samacheer Kalvi 8th Maths Guide Chapter 2 Measurements Ex 2.3

(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
Samacheer Kalvi 8th Maths Guide Answers Chapter 2 Measurements Ex 2.3 1
Answer:
(i) – b
(ii) – a
(iii) – d
(iv) – c

Samacheer Kalvi 8th Maths Guide Chapter 2 Measurements Ex 2.3

Question 3.
Which 3 – D shapes do the following nets represents? Draw them.
(i)
Samacheer Kalvi 8th Maths Guide Answers Chapter 2 Measurements Ex 2.3 2
Answer:
The net represents cube, because it has 6 squares.
Samacheer Kalvi 8th Maths Guide Answers Chapter 2 Measurements Ex 2.3 3

(ii)
Samacheer Kalvi 8th Maths Guide Answers Chapter 2 Measurements Ex 2.3 4
Answer:
The net represents cuboid
Samacheer Kalvi 8th Maths Guide Answers Chapter 2 Measurements Ex 2.3 5

Samacheer Kalvi 8th Maths Guide Chapter 2 Measurements Ex 2.3

(iii)
Samacheer Kalvi 8th Maths Guide Answers Chapter 2 Measurements Ex 2.3 6
Answer:
The net represents Triangular prism
Samacheer Kalvi 8th Maths Guide Answers Chapter 2 Measurements Ex 2.3 7

(iv)
Samacheer Kalvi 8th Maths Guide Answers Chapter 2 Measurements Ex 2.3 8
The net represents square pyramid
Samacheer Kalvi 8th Maths Guide Answers Chapter 2 Measurements Ex 2.3 9

(v)
Samacheer Kalvi 8th Maths Guide Answers Chapter 2 Measurements Ex 2.3 10
Answer:
Ine net represents cylinder
Samacheer Kalvi 8th Maths Guide Answers Chapter 2 Measurements Ex 2.3 11

Samacheer Kalvi 8th Maths Guide Chapter 2 Measurements Ex 2.3

Question 4.
For each solid, three views are given. Identify for each solid, the corresponding Top, Front and Side (T, F and S) views.
Samacheer Kalvi 8th Maths Guide Answers Chapter 2 Measurements Ex 2.3 12
Answer:
Samacheer Kalvi 8th Maths Guide Answers Chapter 2 Measurements Ex 2.3 13

Samacheer Kalvi 8th Maths Guide Chapter 2 Measurements Ex 2.3

Question 5.
Verify Euler’s formula for the table given below.
Samacheer Kalvi 8th Maths Guide Answers Chapter 2 Measurements Ex 2.3 14
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.