Symmetry Class 7 Notes Maths Chapter 14

Symmetry Class 7 Notes Maths Chapter 14

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On this page, you will find Symmetry Class 7 Notes Maths Chapter 14 Pdf free download. CBSE NCERT Class 7 Maths Notes Chapter 14 Symmetry will seemingly help them to revise the important concepts in less time.

CBSE Class 7 Maths Chapter 14 Notes Symmetry

Symmetry Class 7 Notes Conceptual Facts

Symmetry; If a paper is folded in half and the two halves of the paper exactly cover each other, then the shape of the paper is symmetric.

For example:

Symmetry Class 7 Notes Maths Chapter 14 .1

Axis of symmetry: When a figure is folded in half then the line of fold is called axis of symmetry.

For example:

Symmetry Class 7 Notes Maths Chapter 14 .2

Symmetry of regular polygons:

Symmetry Class 7 Notes Maths Chapter 14 .3

Note: Each regular polygon has a many lines of symmetry as it has sides.

Mirror reflection symmetry: The symmetry in which one half of the shape is the image of the other.

For example:

Symmetry Class 7 Notes Maths Chapter 14 .4

Rotational symmetry: When an object rotate clockwise or anticlockwise about a fixed point and when it looks after some rotation by a partial turn then it is called rotational symmetry. This fixed point is known as centre of rotation.

Symmetry Class 7 Notes Maths Chapter 14 .5

Axis of rotation: The line of symmetry about of which an object rotates is called the axis of rotation.

Symmetry Class 7 Notes Maths Chapter 14 .6

Angle of rotation: The angle through which an object rotates is called angle of rotations.

  • A half-turn means rotation by 180°.
  • A quarter-turn means rotations by 90°.
  • A complete-turn means rotation by 360°.

Order of rotational symmetry: If x° be the smallest angle through which a figure can rotate and still looks the same, then the order of rotational symmetry (=left(frac{360}{x}right))

For example:

(i) Order of square ( =frac{360}{90}=4)

(ii) Order of equilateral triangle ( =frac{360}{90}=6)

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