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Line Symmetry

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Title: Students Enchanted by Merlin s Spell! Author: Richard English Last modified by: Maths Staff Created Date: 10/7/2000 10:32:34 AM Document presentation format – PowerPoint PPT presentation

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Title: Line Symmetry


1
Line Symmetry
2
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.


3
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
4
Lines of Symmetry all around us
  • Which of these road signs have got lines of
    symmetry?

Click to see the lines of symmetry.
5
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 ...

6
Line Symmetry with Pentominoes
  • How many lines of symmetry does each Pentomino
    have?
  • Sort them according to their lines of symmetry.

7
Line Symmetry with Pentominoes
One Line of Symmetry
Two Lines of Symmetry
Four Lines of Symmetry
Click to start sorting
8
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 ...

9
Line Symmetry with 7-Pin Polygons
  • How many lines of symmetry does each7-Pin
    Polygon have?
  • Sort them according to their lines of symmetry.

10
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
11
Now you know all about line symmetry!END OF
PRESENTATION
12
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.
13
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.
14
END OF PRESENTATION
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