I am working on homework with properties of triangles and i am lost

can you help

You might look at:

http://www.mathwarehouse.com/geometry/triangles/index.php

This link has a lot more but it gets advanced:

http://mathworld.wolfram.com/Triangle.html

Of course! I'd be happy to help you with properties of triangles. Can you please provide more details about the specific concepts or problems you are having trouble with?