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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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.com Q1. 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
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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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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
Have you updated your Learning Log ?
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