Samacheer Kalvi 8th Maths Guide Chapter 2 Measurements Ex 2.3
Samacheer Kalvi 8th Maths Guide Chapter 2 Measurements Ex 2.3
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.
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