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Rotational Symmetry 7 2 1 5 © 2007 All rights reserved

Rotational Symmetry All 2 dimensional shapes have some rotational symmetry. The degree of rotational symmetry that an object has is known as its order. For shapes that have “order 2” rotational symmetry or higher, a single centre of rotation can be located. For shapes that have only “order 1” rotational symmetry a centre of rotation can be found anywhere within it. Order 1 Order 2 Order 3 Order 4

Rotational Symmetry Order 1 The order of rotational symmetry that an object has is the number of times that it fits on to itself during a full rotation of 3600

Rotational Symmetry 2 Order 1 The order of rotational symmetry that an object has is the number of times that it fits on to itself during a full rotation of 3600 Order 2 1

Rotational Symmetry 2 Order 1 The order of rotational symmetry that an object has is the number of times that it fits on to itself during a full rotation of 3600 3 2 1 Order 3 Order 2 1

Rotational Symmetry Order 1 The order of rotational symmetry that an object has is the number of times that it fits on to itself during a full rotation of 3600. 3 2 2 Order 2 3 1 4 1 Order 3 2 Order 4 1

Rotational Symmetry What is the order of rotational symmetry of the shape below?

Rotational Symmetry What is the order of rotational symmetry of the shape below? 5 4 1 3 Order 5 2

Rotational Symmetry What is the order of rotational symmetry of the shape below?

Rotational Symmetry What is the order of rotational symmetry of the shape below? 6 5 1 2 4 3 Order 6

Equilateral Triangle An equilateral triangle has rotational symmetry of order ?

Equilateral Triangle An equilateral triangle has rotational symmetry of order ?

Equilateral Triangle An equilateral triangle has rotational symmetry of order ? 3 2 1 3

Square A square has rotational symmetry of order ? Square

Square A square has rotational symmetry of order ?

Square 4 A square has rotational symmetry of order ? 3 4 2 1

Regular Pentagon A regular pentagon has rotational symmetry of order ? Pentagon

Regular Pentagon A regular pentagon has rotational symmetry of order ?

Regular Pentagon A regular pentagon has rotational symmetry of order ? 5 4 1 3 2 5

Regular Hexagon A regular hexagon has rotational symmetry of order ? Hexagon

Regular Hexagon A regular hexagon has rotational symmetry of order ?

Regular Hexagon A regular hexagon has rotational symmetry of order ? 5 6 1 4 3 2 6

Regular Octagon A regular octagon has rotational symmetry of order ? Octagon

Regular Octagon A regular octagon has rotational symmetry of order ? 7 8 6 1 5 2 4 3 8

Rectangle A rectangle has rotational symmetry of order ? Rectangle

Rectangle A rectangle has rotational symmetry of order ? 2 2 1

Parallelogram A parallelogram has rotational symmetry of order ? Parallelogram

Parallelogram A parallelogram has rotational symmetry of order ? 2 2 1

Isosceles Triangle An isosceles triangle has rotational symmetry of order ?

Isosceles Triangle An isosceles triangle has rotational symmetry of order ? 1 1

Scalene Triangle An scalene triangle has rotational symmetry of order ? Scalene

Scalene Triangle An scalene triangle has rotational symmetry of order ? 1 1

Isosceles Trapezium An isosceles trapezium has rotational symmetry of order ? Isos Trapezium

Isosceles Trapezium An isosceles trapezium has rotational symmetry of order ? 1 1

Trapezium A trapezium has rotational symmetry of order ? Trapezium

Trapezium A trapezium has rotational symmetry of order ? 1 1

Kite A kite has rotational symmetry of order ? Kite

Kite A kite has rotational symmetry of order ? 1 Kite 1

Rhombus A rhombus has rotational symmetry of order ? Rhombus

Rhombus A rhombus has rotational symmetry of order ? 2 2 1

Ellipse An ellipse has rotational symmetry of order ? Ellipse

Ellipse An ellipse has rotational symmetry of order ? 1 Ellipse 2 2

Rotational Symmetry State the order of rotational symmetry for each shape below: 1 2 3 Order 6 7 6 10 Order 4 8 11 Order 5 Order 2 Order 3 Order 1 Order 2 Order 3 Order 2 5 9 4 12 Order 6 Order 8

Rotational Symmetry State the order of rotational symmetry for each shape below: 13 14 Order 4 17 15 Order 1 18 22 21 Order 5 19 20 Order 3 Order 6 23 Order 4 Order 5 Order 2 Order 4 Order 2 16 24 Order 3 Order 1

Now. . it’s the time for… To ignite your minds. .

@ First, Observe the given Picture carefully. @ Try to Imagine the rotation @ Concentrate on the inner designs also @ Each question carries ‘ 1 m’ as usual @ Time limit for each Work sheet is ‘ 5 min. , ’ only # WRITE ONLY THE ORDER OF ROTATIONAL SYMMETRY IN THE GIVEN BOXES

Rotational Symmetry State the order of rotational symmetry for each shape below: 1 2 5 6 9 10 3 4 7 8 Worksheet 1

Rotational Symmetry State the order of rotational symmetry for each shape below: 11 12 13 14 15 16 17 18 19 20 Worksheet 2

Credits & Acknowledges ! • • The master trainer. Mr. N. Uma Srinivas MS Office MS Encarta www. whiteboardmath. com www. teachingideas. com www. pppst. com Perspector panel VIPS Knowledge Centre.