Transcript Line Symmetry - Numeracy Software

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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 don’t 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
Click to start sorting
Four Lines of
Symmetry
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Line Symmetry with 7-Pin Polygons
• If you don’t 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 each
7-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
Three Lines of
Symmetry
Click to start sorting
Six Lines of
Symmetry
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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.
Here is an example
of a pentomino.
These are NOT
pentominoes.
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