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No rotational Symmetry
Order 4 Order 3 Order 2
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Order 5 Order 6 Order 3 Order 5
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No rotational Symmetry
Order 5 Order 3 Order 6 No rotational Symmetry
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TOP How many times does this shape fit into itself?
We say a shape has ROTATIONAL SYMMETRY if it fits exactly into itself (looks exactly THE SAME) when it is rotated. TOP How many times does this shape fit into itself? We say it has rotational symmetry of order 4
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A shape may have NO Rotational Symmetry
A shape is said to have NO Rotational Symmetry If it fits onto itself only ONE TIME
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The ORDER of Rotational Symmetry
The order of rotational symmetry of a shape is determined by how many times the shape fits onto itself during a 360° turn.
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Take a whiteboard each please!
L.O. To be able to find the order of rotational symmetry of any given shape
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Equilateral Triangle An equilateral triangle has rotational symmetry of order ? 3 3 2 1
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Square A square has rotational symmetry of order ? Square
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Square A square has rotational symmetry of order ?
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Square A square has rotational symmetry of order ? 4 3 4 2 1
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Regular Pentagon A regular pentagon has rotational symmetry of order ?
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Regular Pentagon A regular pentagon has rotational symmetry of order ? 5 5 4 1 3 2
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Hexagon Regular Hexagon
A regular hexagon has rotational symmetry of order ? Hexagon
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Regular Hexagon A regular hexagon has rotational symmetry of order ?
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Regular Hexagon A regular hexagon has rotational symmetry of order ? 6
5 6 4 1 3 2
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What did we say about lines of symmetry in regular polygons?
What did we say a Regular Polygon is? A regular polygon is a shape which has: All sides equal All angles equal Examples ? What did we say about lines of symmetry in regular polygons? Regular polygons have lines of symmetry equal to the number of sides/angles that they have
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What can we also conclude?
Regular polygons have order of rotational symmetry equal to the number of sides/angles that they have. For REGULAR POLYGONS No. of sides No. of angles Lines of symmetry Order
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Rectangle A rectangle has rotational symmetry of order ? Rectangle
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Rectangle A rectangle has rotational symmetry of order ? 2 2 1
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What is the order of rotational symmetry?
answer
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What is the order of rotational symmetry?
answer
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Isos Tri Isosceles Triangle
An isosceles triangle has rotational symmetry of order ? Isos Tri
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No rotational Symmetry
Isosceles Triangle An isosceles triangle has rotational symmetry of order ? 1 No rotational Symmetry Isos Tri
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Scalene Tri Scalene Triangle
An scalene triangle has rotational symmetry of order ? Scalene Tri
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No rotational Symmetry
Scalene Triangle An scalene triangle has rotational symmetry of order ? No rotational Symmetry 1
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Isos Trapezium Isosceles Trapezium
An isosceles trapezium has rotational symmetry of order ? Isos Trapezium
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No rotational Symmetry
Isosceles Trapezium An isosceles trapezium has rotational symmetry of order ? No rotational Symmetry 1
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Trapezium A trapezium has rotational symmetry of order ? Trapezium
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No rotational Symmetry
Trapezium A trapezium has rotational symmetry of order ? No rotational Symmetry 1
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Kite A kite has rotational symmetry of order ? Kite
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No rotational Symmetry
Kite No rotational Symmetry A kite has rotational symmetry of order ? 1
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Rhombus A rhombus has rotational symmetry of order ? Rhombus
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Rhombus 2 A rhombus has rotational symmetry of order ? 2 1
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Homework Go over PowerPoints making sure you feel confident in both line symmetry and rotational symmetry It’s the end of symmetry topic
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