About
This simulation is designed to help visualize the symmetry about O and 90 degrees line of letters of the english language for primary mathematics.
more resources can be found here
http://iwant2study.org/ospsg/index.php/interactive-resources/mathematics

Interesting Fact
This app is available on Android, iOS and on the web.

Acknowledgement
My sincere gratitude for the tireless contributions of Francisco Esquembre, Fu-Kwun Hwang, Wolfgang Christian, Félix Jesús Garcia Clemente, Anne Cox, Andrew Duffy, Todd Timberlake and many more in the Open Source Physics community.

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FaceBook Fan Page: https://www.facebook.com/Open-Source-Physics-Easy-Java-Simulation-Tracker-132622246810575/
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Blog: http://weelookang.blogspot.sg/
Digital Library: http://iwant2study.org/ospsg/