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Mathematics 20 Online
OpenStudy (christos):

http://screencast.com/t/BytqwR9u What is that sign ? What does it mean ?

OpenStudy (radar):

This is a SWAG: maybe "not parallel"|dw:1399910725533:dw|

OpenStudy (radar):

What does your text say?

OpenStudy (radar):

I did a "google" look at this. http://www.basic-mathematics.com/geometry-symbols.html

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