EASY
7th CBSE
IMPORTANT
Earn 100

A square has a rotational symmetry of order

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Important Points to Remember in Chapter -1 - Symmetry from Subject Experts Foundation Course Mathematics Solutions

1. Line of Symmetry:

(i) If a line divides a figure into two parts such that when the figure is folded about the line the two parts of the figure coincide, then the line is known as the line of symmetry.

(ii) The line of symmetry is also known as the axis of symmetry.

2. Rotational Symmetry:

(i) A figure is said to have rotational symmetry if it fits on to itself more than once during a full turn i.e. rotation through 360°.

(ii) The number of times a figure fits onto itself in one full turn is called the order of rotational symmetry.

(iii) Following table provides the details of linear and rotational symmetries of various figures:

Figure Line Symmetry No, of Line Symmetry Rotational Symmetry Centre of Rotation Order of Rotational Symmetry
Square Yes 4 Yes Intersection of diagonals 4
Rectangle Yes 2 Yes Intersection of diagonals 2
Equilateral Triangle Yes 3 Yes Centroid 3
Regular Hexagon Yes 6 Yes Centre of the hexagon 6
Circle Yes Unlimited Yes Centre Unlimited
Parallelogram No 0 Yes Intersection of diagonals 2
Rhombus Yes 2 Yes Intersection of diagonals 2