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MTH 3-19a MTH 4-19a Symmetry Symmetry Line Symmetry Rotation (Turn) Symmetry Translational Symmetry www.mathsrevision.com Creating Rotational Symmetry

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• Line Symmetry

How many lines of symmetry do these shapes have ?

Square (4 lines)Equilateral Triangle (3 lines)

• Line Symmetry

How many lines of symmetry do these shapes have ?

Rectangle (2 lines)Isosceles Triangle (1 lines)

• Line Symmetry

How many lines of symmetry do these shapes have ?

Kite (1 line)Rhombus (2 lines)

• Line Symmetry

How many lines of symmetry do these shapes have ?

Parallelogram No lines of Symmetry

• Line Symmetry

How many lines of symmetry do these shapes have ?

Trapezium 1 (1 line)Trapezium 2No line of Symmetry

• Line Symmetry

How many lines of symmetry do these shapes have ?

Hexagon (6 lines)(2 lines)

• Line Symmetry

Draw the other side of the shape so it has line symmetry.

• Line Symmetry

Draw the other side of the shape so it has line symmetry.

MTH 3-19aMTH 4-19a

*Created by Mr. Lafferty Maths Dept.Now try TJ3bEx 1

Ch11 (page 105)www.mathsrevision.comLine Symmetry

MTH 3-19aMTH 4-19a

Starter Questionswww.mathsrevision.comQ1.Round the following to the first decimal place.Q2.What fraction is the green area. What fraction is the grey area.Q3.A pencil costs 22p. How much doesa 1000 cost. Put your answer in s.(a) 153.37(b)261.55

MTH 3-19aMTH 4-19a

www.mathsrevision.comLearning IntentionSuccess CriteriaUnderstand the terms rotational symmetry.We are learning what rotational symmetry and its order. Rotation (Turn) Symmetry 2. State the turn symmetry and order for shapes.

• Rotation (Turn) Symmetry

Draw the other side of the shape rotated through 180o around the red point.

This new shape has half-turn symmetry ORDER 2.

Order 2 means it looks the same twice as it is rotated through 360o.

• Rotation (Turn) Symmetry

State the turn symmetry for each and its order.

Square ( turn symmetry)Order 4Rectangle ( turn symmetry)Order 2

MTH 3-19aMTH 4-19a

*Created by Mr. Lafferty Maths Dept.Now try TJ3bEx 2

Ch11 (page 107)www.mathsrevision.comRotation (Turn) Symmetry

MTH 3-19aMTH 4-19a

Starter Questionswww.mathsrevision.comQ1.CalculateQ4.Find the perimeter and area of the square.Q3.Q2.What is the time difference between 8.15am and 1:00pmQ5.Find the order of rotational symmetry for the shape opposite.5cm132456A=25cm2P=20cm

MTH 3-19aMTH 4-19a

Creating Half-TurnSymmetrywww.mathsrevision.comLearning IntentionSuccess CriteriaUnderstand the terms half-turn symmetry.We are learning how we can create half-turn symmetry for a shape. Draw the other half of a shape such that it has half-turn symmetry.

• Creating Half -Turn Symmetry

Draw the other side of the shape rotated through 180o around the red point.

The final shape depends on the centre of rotation.

• Creating Half -Turn Symmetry

Draw the other side of the shape rotated through 180o around the red point.

MTH 3-19aMTH 4-19a

*Created by Mr. Lafferty Maths Dept.Now try TJ3bEx 3

Ch11 (page 110)www.mathsrevision.comCreating Half-Turn Symmetry

MTH 3-19aMTH 4-19a

Starter Questionswww.mathsrevision.comQ1.CalculateQ4.(-2) + (-3)Q3.Q2.What is the time difference between 8.15am and 1:00pmQ5.How many lines of symmetry doesregular hexagon have.

MTH 3-19aMTH 4-19a

Translation (slide)Symmetrywww.mathsrevision.comLearning IntentionSuccess CriteriaUnderstand the terms translational, slide congruent and tile.We are learning the meaning of Translational (slide) symmetry using tile patterns. Identify shapes that tile.Construct a tile pattern for shapes.

• Translation (Slide) Symmetry

A shape that tiles can be completely surrounded by congruent shapes WITHOUT leaving any gaps.

Using Slide SymmetryShape tilesDOES NOT tilesGaps between shapesGapsGaps

• Translation (Slide) SymmetryHow can you tell if the tiling is complete ?

• Translation (Slide) Symmetry

• Translation (Slide) SymmetryIs this the complete tiling ?No !Why ?Complete the tiling

MTH 3-19aMTH 4-19a

www.mathsrevision.comTranslation (slide) SymmetryWrite down as many tile patterns as you canthat you see every day.

MTH 3-19aMTH 4-19a

*Created by Mr. Lafferty Maths Dept.Now try TJ3bEx 4

Ch11 (page 112)www.mathsrevision.comTranslation (Slide) Symmetry

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