MTH 3-19aMTH 4-19a

SymmetrySymmetry

Line Symmetry

Rotation (Turn) Symmetry

Translational Symmetry

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Creating Rotational Symmetry

MTH 3-19aMTH 4-19a

Starter QuestionsStarter Questionsw

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Q2. If 1 bar of chocolate costs 65p. How much will1000 bars cost. Give your answer in £’s.

(a) 4.56 (b) 7.254 (c) 9.244

Q3. Round to 1 decimal place

Q4. Convert to 24 hrs clock

(a) Half past 4 in the af ternoon.

(b) Quarter to eight in the morning.

MTH 3-19aMTH 4-19a

Line SymmetryLine Symmetryw

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1.1. Understand the term line Understand the term line symmetry.symmetry.

1. We are learning how to recognise and create line symmetry.

2.2. Complete Drawings Complete Drawings given the line of given the line of symmetry.symmetry.

MTH 3-19aMTH 4-19a

Line SymmetryLine Symmetryw

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A line symmetry occurs in a shape if, when the shape is folded over the line the two pieces either side of the line, are exactly the same.

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 2

No 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

21 Apr 202321 Apr 2023 Created by Mr. Lafferty Maths Dept.Created by Mr. Lafferty Maths Dept.

Now try TJ3bEx 1

Ch11 (page 105)

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Line SymmetryLine Symmetry

MTH 3-19aMTH 4-19a

Starter QuestionsStarter Questionsw

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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

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1.1. Understand the terms Understand the terms rotational symmetry.rotational symmetry.

1. We are learning what rotational symmetry and its order.

Rotation (Turn) Rotation (Turn) Symmetry Symmetry

2. 2. State the turn symmetry State the turn symmetry and order for shapes.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 (¼ turn symmetry)

Order 4

Rectangle (½ turn symmetry)

Order 2

MTH 3-19aMTH 4-19a

21 Apr 202321 Apr 2023 Created by Mr. Lafferty Maths Dept.Created by Mr. Lafferty Maths Dept.

Now try TJ3bEx 2

Ch11 (page 107)

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Rotation (Turn) Rotation (Turn) Symmetry Symmetry

MTH 3-19aMTH 4-19a

Starter Starter QuestionsQuestions

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.com 30% of £600Q1. Calculate

Q4. Find the perimeter and area of the square.

Q3.

Q2. What is the time difference between 8.15am and 1:00pm

Solve 6y-16 20

Q5. Find the order of rotational symmetry for the shape opposite.

5cm

1

3 2

4

5 6

A=25cm2

P=20cm

MTH 3-19aMTH 4-19a

Creating Half-TurnCreating Half-TurnSymmetrySymmetry

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1.1. Understand the terms Understand the terms half-turn symmetry.half-turn symmetry.

1. We are learning how we can create half-turn symmetry for a shape.

2.2. Draw the other half of a Draw the other half of a shape such that it has shape such that it has half-turn symmetry.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

21 Apr 202321 Apr 2023 Created by Mr. Lafferty Maths Dept.Created by Mr. Lafferty Maths Dept.

Now try TJ3bEx 3

Ch11 (page 110)

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Creating Half-TurnCreating Half-TurnSymmetrySymmetry

MTH 3-19aMTH 4-19a

Starter Starter QuestionsQuestions

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133 % of £ 180

3Q1. Calculate

Q4. (-2) + (-3)

Q3.

Q2. What is the time difference between 8.15am and 1:00pm

Solve 2 4 20 x

Q5. How many lines of symmetry doesregular hexagon have.

MTH 3-19aMTH 4-19a

Translation (slide)Translation (slide)SymmetrySymmetry

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1.1. Understand the terms Understand the terms translational, slide translational, slide congruent and tile.congruent and tile.

1. We are learning the meaning of Translational (slide) symmetry using tile patterns.

2.2. Identify shapes that tile.Identify shapes that tile.

3.3. Construct a tile pattern Construct a tile pattern for shapes.for shapes.

Translation (Slide) Symmetry

A shape that tiles can be completely surrounded by

congruent shapes WITHOUT leaving any

gaps.

Using Slide SymmetryShape tiles

DOES NOT tilesGaps between shapes

GapsGaps

Translation (Slide) Symmetry

How can you tell if the tiling is complete ?

Translation (Slide) Symmetry

Translation (Slide) Symmetry

Is this the complete

tiling ?No !

Why ?

Complete the tiling

MTH 3-19aMTH 4-19a

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Translation (slide)Translation (slide)SymmetrySymmetry

Write down as many tile patterns as you canthat you see every day.

MTH 3-19aMTH 4-19a

21 Apr 202321 Apr 2023 Created by Mr. Lafferty Maths Dept.Created by Mr. Lafferty Maths Dept.

Now try TJ3bEx 4

Ch11 (page 112)

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Translation (Slide)Translation (Slide)SymmetrySymmetry

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