Teachers Network
Translate Translate English to Chinese Translate English to French
  Translate English to German Translate English to Italian Translate English to Japan
  Translate English to Korean Russian Translate English to Spanish
Lesson Plan Search
Proud New Owners of teachnet.org... We're Very Flattered... But Please Stop Copying this Site. Thank You.
Our Lesson Plans
TeachNet Curriculum Units
Classroom Specials
Popular Teacher Designed Activities
TeachNet NYC Dirctory of Lesson Plans

VIDEOS FOR TEACHERS
RESOURCES
Teachers Network Leadership Institute
How-To Articles
Videos About Teaching
Effective Teachers Website
Lesson Plans
TeachNet Curriculum Units
Classroom Specials
Teacher Research
For NYC Teachers
For New Teachers
HOW-TO ARTICLES
TEACHER RESEARCH
LINKS

GRANT WINNERS
TeachNet Grant:
Lesson Plans
2010
TeachNet Grant Winners
2009
TeachNet Grant Winners
Adaptor Grant Winners
2008
TeachNet Grant Winners
Adaptor Grant Winners
2007
TeachNet Grant Winners
Adaptor Grant Winners
Other Grant Winners
Power-to-Learn
Math and Science Learning
Ready-Set-Tech
Impact II
Grant Resources
Grant How-To's
Free Resources for Teachers
ABOUT
Our Mission
Funders
   Pacesetters
   Benefactors
   Donors
   Sponsors
   Contributors
   Friends
Press
   Articles
   Press Releases
Awards
   Cine
   Silver Reel
   2002 Educational Publishers Award

Sitemap

Symmetry: Symmetry All Around You - Point Symmetry

 

Mathematics is much more than finding sums, differences, products, and quotients. Mathematics is a way of looking at the world. As a mathematician, you view the world looking for regularity and order or the lack of order and regularity.

Point Symmetry

We are surrounded by all types of symmetry, a type of regularity and order--in nature, in architecture, in art and much more. volleyball

The symmetry that is the least talked about is point symmetry even though it can be spotted everywhere in the world around you, however. Point symmetry is a special subset of rotational symmetry. In other words, any figure that has point symmetry has rotational symmetry. However, any figure with rotational symmetry does not necessarily have point symmetry.

A figure that can be turned about a point 180 degrees and land on an image of itself is said to have point symmetry and rotational symmetry of order 2. Another way to check for point symmetry is to turn the image upside down and see if it looks exactly the same! The picture of the basketball has point symmetry. It has rotational symmetry of order 2 and magnitude of 180 degrees so it also has point symmetry.

When you look at the examples of point symmetry below find the order of rotation for the figures with and the figures without point symmetry to see if you can find a pattern.

These objects have point symmetry:

These objects do not have point symmetry:
sea flower





For more information and activities about Point Symmetry, visit these pages.

[Pattern Blocks] [Cards] [Activities] [Extensions] [Challenge] [Symmetry Home Page]


These symmetry pages have been brought to you by Nancy Powell, a TeachNet Web Mentor from Bloomington High School, Bloomington, IL.

 

Come across an outdated link?
Please visit The Wayback Machine to find what you are looking for.

 

Journey Back to the Great Before