Symmetry Class 7 PPT

 Page 2


What is a line of 
symmetry?
• A line on which a figure can be folded so 
that both sides match.
– Maryland Content Standard 2.E.2 – Identify and 
describe symmetry in geometric figures or pictures. 
(Up to four lines of symmetry)
Page 3


What is a line of 
symmetry?
• A line on which a figure can be folded so 
that both sides match.
– Maryland Content Standard 2.E.2 – Identify and 
describe symmetry in geometric figures or pictures. 
(Up to four lines of symmetry)
To be a line of symmetry, 
the shape must have two 
halves that match exactly.
When you trace a heart onto 
a piece of folded paper, 
and then cut it out, the two half 
hearts make a whole heart.  
The two halves are symmetrical.
Page 4


What is a line of 
symmetry?
• A line on which a figure can be folded so 
that both sides match.
– Maryland Content Standard 2.E.2 – Identify and 
describe symmetry in geometric figures or pictures. 
(Up to four lines of symmetry)
To be a line of symmetry, 
the shape must have two 
halves that match exactly.
When you trace a heart onto 
a piece of folded paper, 
and then cut it out, the two half 
hearts make a whole heart.  
The two halves are symmetrical.
Which of these flags have a 
line of symmetry?
United States of America Canada
Maryland England
Page 5


What is a line of 
symmetry?
• A line on which a figure can be folded so 
that both sides match.
– Maryland Content Standard 2.E.2 – Identify and 
describe symmetry in geometric figures or pictures. 
(Up to four lines of symmetry)
To be a line of symmetry, 
the shape must have two 
halves that match exactly.
When you trace a heart onto 
a piece of folded paper, 
and then cut it out, the two half 
hearts make a whole heart.  
The two halves are symmetrical.
Which of these flags have a 
line of symmetry?
United States of America Canada
Maryland England
What about these math symbols?
Do they have symmetry?