eVidyarthi

Main Menu
  • eVidyarthi
  • School
    • Class 6th
      • Maths Class 6
      • Science Class 6
      • Hindi Class 6
      • व्याकरण
      • English Class 6
      • English Grammar
      • Sanskrit Class 6
      • Geography
      • Civics
      • History
    • Class 7th
      • Maths Class 7
      • Science Class 7
      • Hindi Class 7
      • व्याकरण
      • English Class 7
      • English Grammar
      • Sanskrit Class 7
      • Geography
      • Civics
      • History
    • Class 8th
      • Maths Class 8
      • Science Class 8
      • Hindi Class 8
      • व्याकरण
      • English Class 8
      • English Grammar
      • Sanskrit Class 8
      • Geography
      • Civics
      • History
    • Class 9th
      • Maths Class 9
      • Science Class 9
      • Hindi Class 9
      • English Class 9
      • English Grammar
      • व्याकरण
      • Economics Class 9
      • Geography Class 9
      • Civics Class 9
      • History Class 9
    • Class 10th
      • Maths Class 10
      • Science Class 10
      • Hindi Class 10
      • English Class 10
      • English Grammar
      • व्याकरण
      • Economics Class 10
      • History Class 10
      • Civics Class 10
      • Geography Class 10
    • Class 11th
      • Maths Class 11
      • Accounts Class 11
      • English Class 11
      • English Grammar
      • व्याकरण
      • Chemistry Class 11
      • Physics Class 11
      • Biology Class 11
    • Class 12th
      • Maths Class 12
      • Accounts Class 12
      • Chemistry Class 12
      • Physics Class 12
      • Biology Class 12
      • English Class 12
      • English Grammar
      • व्याकरण
    • Close
  • English
    • Basic English Grammar
    • Basic English Speaking
    • English Vocabulary
    • English Idioms & Phrases
    • Personality Enhancement
    • Interview Skills
    • Close
  • Softwares
    • Microsoft Word
    • PhotoShop
    • Excel
    • Illustrator
    • PowerPoint
    • Close
Maths Class 7 || Menu
  • Important
    • Sample Paper
    • Important Formulas
    • Revision Notes
    • Mathematics Book
    • MCQs
    • Close
  • Integers
    • Ex 1.1
    • Ex 1.2
    • Ex 1.3
    • Ex 1.4
    • MCQs
    • Ex. 1.1 NCERT Solutions
    • Ex. 1.2 NCERT Solutions
    • Ex. 1.3 NCERT Solutions
    • Ex. 1.4 NCERT Solutions
    • Close
  • Fractions and Decimals
    • Ex 2.1
    • Ex 2.2
    • Ex 2.3
    • Ex 2.4
    • Ex 2.5
    • Ex 2.6
    • Ex 2.7
    • MCQs
    • Ex. 2.1 NCERT Solutions
    • Ex. 2.2 NCERT Solutions
    • Ex. 2.3 NCERT Solutions
    • Ex. 2.4 NCERT Solutions
    • Ex. 2.5 NCERT Solutions
    • Ex. 2.6 NCERT Solutions
    • Ex. 2.7 NCERT Solutions
    • Close
  • Data Handling
    • Ex 3.1
    • Ex 3.2
    • Ex 3.3
    • Ex 3.4
    • MCQs
    • Ex. 3.1 NCERT Solutions
    • Ex. 3.2 NCERT Solutions
    • Ex. 3.3 NCERT Solutions
    • Ex. 3.4 NCERT Solutions
    • Close
  • Simple Equations
    • Ex 4.1
    • Ex 4.2
    • Ex 4.3
    • Ex 4.4
    • MCQs
    • Ex. 4.1 NCERT Solutions
    • Ex. 4.2 NCERT Solutions
    • Ex. 4.3 NCERT Solutions
    • Ex. 4.4 NCERT Solutions
    • Close
  • Lines and Angles
    • Ex 5.1
    • Ex 5.2
    • MCQs
    • Ex. 5.1 NCERT Solutions
    • Ex. 5.2 NCERT Solutions
    • Close
  • Triangle and its Properties
    • Ex 6.1
    • Ex 6.2
    • Ex 6.3
    • Ex 6.4
    • Ex 6.5
    • MCQs
    • Ex. 6.1 NCERT Solutions
    • Ex. 6.2 NCERT Solutions
    • Ex. 6.3 NCERT Solutions
    • Ex. 6.4 NCERT Solutions
    • Ex. 6.5 NCERT Solutions
    • Close
  • Congruence of Triangles
    • Ex 7.1
    • Ex 7.2
    • MCQs
    • Ex. 7.1 NCERT Solutions
    • Ex. 7.2 NCERT Solutions
    • Close
  • Comparing Quantities
    • Ex 8.1
    • Ex 8.2
    • Ex 8.3
    • MCQs
    • Ex. 8.1 NCERT Solutions
    • Ex. 8.2 NCERT Solutions
    • Ex. 8.3 NCERT Solutions
    • Close
  • Rational Numbers
    • Ex 9.1
    • Ex 9.2
    • MCQs
    • Ex. 9.1 NCERT Solutions
    • Ex. 9.2 NCERT Solutions
    • Close
  • Practical Geometry
    • Ex 10.1
    • Ex 10.2
    • Ex 10.3
    • Ex 10.4
    • Ex 10.5
    • MCQs
    • Ex. 10.1 NCERT Solutions
    • Ex. 10.2 NCERT Solutions
    • Ex. 10.3 NCERT Solutions
    • Ex. 10.4 NCERT Solutions
    • Ex. 10.5 NCERT Solutions
    • Close
  • Perimeter and Area
    • Ex 11.1
    • Ex 11.2
    • Ex 11.3
    • Ex 11.4
    • MCQs
    • Ex. 11.1 NCERT Solutions
    • Ex. 11.2 NCERT Soluions
    • Ex. 11.3 NCERT Solutions
    • Ex 11.4 NCERT Solutions
    • Close
  • Algebraic Expressions
    • Ex 12.1
    • Ex 12.2
    • Ex 12.3
    • Ex 12.4
    • MCQs
    • Ex. 12.1 NCERT Solutions
    • Ex. 12.2 NCERT Solutions
    • Ex. 12.3 NCERT Solutions
    • Ex. 12.4 NCERT Solutions
    • Close
  • Exponents & Powers
    • Ex 13.1
    • Ex 13.2
    • Ex 13.3
    • MCQs
    • Ex. 13.1 NCERT Solutions
    • Ex. 13.2 NCERT Solutions
    • Ex. 13.3 NCERT Solutions
    • Close
  • Symmetry
    • Ex 14.1
    • Ex 14.2
    • Ex 14.3
    • MCQs
    • Ex. 14.1 NCERT Solutions
    • Ex. 14.2 NCERT Solutions
    • Ex. 14.3 NCERT Solutions
    • Close
  • Visualising Solid Shapes
    • Ex 15.1
    • Ex 15.2
    • Ex 15.3
    • Ex 15.4
    • MCQs
    • Ex. 15.1 NCERT Solutions
    • Ex. 15.2 NCERT Solutions
    • Ex. 15.3 NCERT Solutions
    • Ex. 15.4 NCERT Solutions
    • Close

Class 7 Ex. 14.2 Maths NCERT Solutions

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 figure (a), (b), (d), (e) and (f) have rotational symmetry more than 1.

Question 2.
Give the order of rotational symmetry for each figure:

Solution:

Let us take a point S on one end of the given figure. Rotating by 180°, S comes at other end and then again rotating by 180°, it comes at its original position.
∴ Order of rotational symmetry = 360°/180°=2

Let us take any point S in figure (1). It takes two rotations to come back to its original position.
∴ Order of rotational symmetry = 360°/180° = 2

Let us mark any vertex of the given figure. It takes three rotations to come back to its original shape.
∴ Order of rotational symmetry = 360°/120° = 3


Order of rotational symmetry = 360°/90° = 4

∴ Order of rotational symmetry = 360°/90° = 4
(f) The given figure is a regular pentagon which can take one rotation at an angle of 72°.
∴ Order of rotational symmetry = 360°/72° = 5
(g) The given figure requires six rotations each through an angle of 60°
∴ Order of rotational symmetry = 360°/60 = 6
(h) The given figure requires three rotations, each through an angle of 120°.
∴ Order of rotational symmetry = 360°/120° = 3

Android App

eVidyarthi

Search On eVidyarthi

Evidyarthi on Facebook

Like us on Facebook

Follow Evidyarthi on Youtube

Learn English
Learn English Through हिन्दी
Job Interview Skills
English Grammar
हिंदी व्याकरण - Vyakaran
Mathematics Class 6th
Science Class 6th
हिन्दी Class 6th
Mathematics Class 7th
Science Class 7th
हिन्दी Class 7th
Mathematics Class 8th
Science Class 8th
हिन्दी Class 8th
Mathematics Class 9th
English Class 9th
Science Class 9th
Mathematics Class 10th
English Class 10th
Mathematics Class XI
Chemistry Class XI
Accountancy Class 11th
Accountancy Class 12th
Mathematics Class 12th
Microsoft Word
Microsoft Excel
Microsoft PowerPoint
Adobe PhotoShop
Adobe Illustrator
Learn German
Learn French
IIT JEE
Privacy Policies, Contact Us
Copyright © 2020 eVidyarthi and its licensors. All Rights Reserved.