formulas of straight lines
- Created by: hannah
- Created on: 15-12-12 15:44
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- straight lines
- midpoint
- (x1+x2/2)+(y1+y2/2)
- gradient
- y2-y1/x2-x1
- length
- /(x2-x1)^2+(y2-y1)^2
- EQUATION
- y-y1=m(x1-x)
- y=mx+c
- if its perpendicular:
- then the gradient is the negative reciprocal
- midpoint
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