Post on 18-Jan-2016
© T Madas
© T Madas
A line of symmetry is sometimes called a mirror line
Line of symmetry
A 2D shape has a line of symmetry if the line divides the shape into 2 congruent halves, one the mirror image of the other.
A
B
Congruent = IDENTICAL
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How many lines of symmetry does a square have?
How many lines of symmetry does a rectangle have?
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If a line, is a line of symmetry then the shape must fold exactly onto itself along that line.
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Is this a line of symmetry?
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L2
L1
L3 L4
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Find the lines of symmetry of these shapes
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A B C D E F G H I J K L M N O P Q R S T U V W X Y Z
Copy each capital letter neatly and then mark all its lines of symmetry
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none
infinite
1 2 3 4 5
6 78
9 1011
12 1314
15 1617
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© T Madas
none
infinite
1 2 3 4 5
6 78
9 1011
12 1314
15 1617
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© T Madas
A square piece of paper is folded in half, then in half again and then 2 shapes are cut out.
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A square piece of paper is folded in half, then in half again and then 2 shapes are cut out.
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A square piece of paper is folded in half, then in half again and then 2 shapes are cut out.
Which figure shows what the paper will look like if we unfold it.
A B C
D E F
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A square piece of paper is folded diagonally in half, then diagonally in half again and then a square is cut out.
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A square piece of paper is folded diagonally in half, then diagonally in half again and then a square is cut out.
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A square piece of paper is folded diagonally in half, then diagonally in half again and then a square is cut out.
Which figure shows what the paper will look like if we unfold it.
A B C
D E F
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a) Mark all the lines of symmetry on each shape.
b) For the shapes that have rotational symmetry, write down its order.
1 2
3 4
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a) Mark all the lines of symmetry on each shape.
b) For the shapes that have rotational symmetry, write down its order.
1 2
3 4
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1
a) Mark all the lines of symmetry on each shape.
b) For the shapes that have rotational symmetry, write down its order.
2
3 4
Order 3
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1
a) Mark all the lines of symmetry on each shape.
b) For the shapes that have rotational symmetry, write down its order.
2
3 4
Order 3
Order 2
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1
a) Mark all the lines of symmetry on each shape.
b) For the shapes that have rotational symmetry, write down its order.
2
3 4
Order 3
Order 2
Order 1
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1
a) Mark all the lines of symmetry on each shape.
b) For the shapes that have rotational symmetry, write down its order.
2
3 4
Order 3
Order 1
Order 1
Order 2
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© T Madas
Look at the shapes labelled as A to F1. Write the letter of the shapes that have 2
lines of symmetry.2. Write the letter of the shapes that have
rotational symmetry of order 2.
A B C
D E F
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Look at the shapes labelled as A to F1. Write the letter of the shapes that have 2
lines of symmetry.2. Write the letter of the shapes that have
rotational symmetry of order 2.
A B C
D E F
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A CB
Four road signs are shown below.
1. Write down the letter of the two signs that have one line of symmetry.
2. Write down the letter of the sign that has rotational symmetry and state the order of this symmetry.
D
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A B
Four road signs are shown below.
1. Write down the letter of the two signs that have one line of symmetry.
2. Write down the letter of the sign that has rotational symmetry and state the order of this symmetry.
C D
Order 3
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