Exercise 14.2 Symmetry -NCERT Solutions Class 7

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Chapter 14 Ex.14.2 Question 1

Which of the following figures have rotational symmetry of order more than \(1\):

Solution

Video Solution

What is known?

Figures

What is unknown?

The figures have rotational symmetry of order more than \(1\).

Reasoning:

To solve this question, remember the concept of rotational symmetry. Rotational symmetry is when an object is rotated around a center point (turned) a number of degrees and the object appears the same. The order of symmetry is the number of positions the object looks the same in a \(360^\circ\) rotation.

Steps:

Rotational symmetry of order more than one are: (a), (b), (c), (d), (e) and (f)  because in these figures, in a complete turn more than one number of times an object looks exactly the same.

Chapter 14 Ex.14.2 Question 2

Give the order of rotational symmetry for each figure:

Solution

Video Solution

What is known?

Figures.

What is unknown?

The order of rotational symmetry

Reasoning:

To solve this question, remember the concept of rotational symmetry. Rotational symmetry is when an object is rotated around a centre point (turned) a number of degrees and the object appears the same. The order of symmetry is the number of positions the object looks the same in a \(360^\circ \) rotation.

Steps:

Figure Order of Rotational Symmetry
a 2
b 2
c 3
d 4
e 4
f 5
g 6
h 3
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