- lengths of line segments
- gradients of lines
- equations of lines
- equations in form ax + by + c = 0
- perimeter of a triangle
- showing triangle to be right angled
- area of triangle
http://www.scribd.com/doc/26373150/Core-Revision-Straight-Lines-040210
http://www.scribd.com/doc/26373150/Core-Revision-Straight-Lines-040210
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