- Length of line segment
- Gradient of line from two points
- Equation of line from gradient and one point
- using y=mx + c
- using y-y1=m(x-x1)
http://www.scribd.com/doc/39892849/Core1-Straight-Lines-221010
http://www.scribd.com/doc/39892849/Core1-Straight-Lines-221010
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