Line Symmetry

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Line Symmetry
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Line Symmetry

• If a shape can be folded in half so that one half
  fits exactly on top of the other, then we say
  that the shape has got line symmetry.
• The fold is called a line of symmetry.
• This shape has got a vertical line of symmetry.

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Line Symmetry in the Alphabet

• Which letters have got lines of symmetry?

Click to see the lines of symmetry.
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
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Lines of Symmetry all around us

• Which of these road signs have got lines of
  symmetry?

Click to see the lines of symmetry.
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Line Symmetry with Pentominoes

• If you dont know what a pentomino is, then click
  here.
• If you have done the pentominoes activity before,
  then you will know what a pentomino is and how
  many different pentominoes there are.
• Here they are ...

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Line Symmetry with Pentominoes

• How many lines of symmetry does each Pentomino
  have?
• Sort them according to their lines of symmetry.

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Line Symmetry with Pentominoes
One Line of Symmetry
Two Lines of Symmetry
Four Lines of Symmetry
Click to start sorting
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Line Symmetry with 7-Pin Polygons

• If you dont know what a 7-pin polygon is, then
  click here.
• If you have done the 7-pin polygons activity
  before, then you will know what a 7-pin polygon
  is and how many different ones there are.
• Here they are ...

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Line Symmetry with 7-Pin Polygons

• How many lines of symmetry does each7-Pin
  Polygon have?
• Sort them according to their lines of symmetry.

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Line Symmetry with 7-Pin Polygons
One Line of Symmetry
Two Lines of Symmetry
Six Lines of Symmetry
Three Lines of Symmetry
Click to start sorting
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Now you know all about line symmetry!END OF
PRESENTATION
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Pentominoes

• A pentomino is made out of five squares that are
  connected along at least one edge.

These are NOT pentominoes.
Here is an example of a pentomino.
How many different pentominoes can you find?
Click here to return to line symmetry.
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7-Pin Polygons

• Here is an arrangement of 7 pins.

A 7-pin polygon is a closed shape with straight
sides with corners on the pins.
Here are some examples of 7-pin polygons.
How many different 7-pin polygons can you find?
Click here to return to line symmetry.
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END OF PRESENTATION