# Co-ordinate Geometry Equations

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- Created by: bethfrench99
- Created on: 23-09-15 19:39

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- Co-ordinate Geometry Equations
- The distance between two points
- Square root(x2 - x1) + (y2 - y1)

- The midpoint
- (x1 + x2/2),(y1+y2/2)

- The gradient of a line
- y2 - y1/x2 - x1

- The equation of a line
- y = mx + c
- With gradient: y - y1 = m(x - x1)
- To get integers as the constant: ax + by + c = 0
- With gradient: y - y1 = m(x - x1)
- Rearrange either way
- y = mx + c

- The gradient of a perpendicular line
- When a line has gradient m: -(1/m)
- Two lines with gradients m1 and m2 are perpendicular if: m1m2 = -1

- The distance between two points

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