NCERT Solutions for Class 7 Maths Chapter 14 Symmetry Ex 14.2

NCERT Solutions for Class 7 Maths Chapter 14 Symmetry Ex 14.2

NCERT Solutions for Class 7 Maths Chapter 14 Symmetry Ex 14.2

NCERT Solutions for Class 7 Maths Chapter 14 Symmetry Ex 14.2 are the part of NCERT Solutions for Class 7 Maths. Here you can find the NCERT Solutions for Class 7 Maths Chapter 14 Symmetry Ex 14.2.



Ex 14.2 Class 7 Maths Question 1.

Which of the following figures have rotational symmetry of order more than 1?

Solution:
The figures (a), (b), (d), (e) and (f) have rotational symmetry of order more than 1.

 

Ex 14.2 Class 7 Maths Question 2.

Give the order of rotational symmetry for each figure:


Solution:
(a) Let us mark a point S on one end of the given figure. By rotating the figure 180°, S comes at other end and then again by rotating the figure 180°, it comes at its original position.

Order of rotational symmetry = 360°/180° = 2
(b) Let us mark a point S on one end of the given figure. By rotating the figure 180°, S comes at other end and then again by rotating the figure 180°, S comes at its original position.

Order of rotational symmetry = 360°/180° = 2

(c) Let us mark any vertex of the given figure as P. It takes three rotations of 120° to come back to its original position.

Order of rotational symmetry = 360°/120° = 3
(d) Order of rotational symmetry = 360
°/90° = 4

(e) Order of rotational symmetry = 360°/90° = 4

(f) The given figure is a regular pentagon which can take one rotation of 72° to obtain its original position.
Order of rotational symmetry = 360°/72° = 5

(g) The given figure requires six rotations of 60° to obtain its original position.
Order of rotational symmetry = 360°/60° = 6

(h) The given figure requires three rotations of 120° to obtain its original position.
Order of rotational symmetry = 360°/120° = 3


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