6. Gradient of line passing through X and Y
- Y2-Y1/X2-X1
- X2-X1/Y2-Y1
7. Distance formula
- square root of (x2-x1)^2+(y2-y1)^2
- square root of (x2+x1)^2-(y2+y1)^2
8. B^2-4AC<0
- no real roots
- real distinct roots
9. area of a triangle
- 1/2ABsinC
- 1/2ABcosC
10. how to find the Median
- Midpoint, gradient, straight line
- midpoint, straightline
11. Gradient given of theta.
- Tan theta
- mx+c
12. equation of vertical line
- y-b=m(x-a)
- ax+by=c
- y=mc+c
13. LogxY=?
- LogxY=LogaY/LogaX
- LogxY=LogaX/LogaY
14. Straight line formula of non vertical line
- y=mx+c
- y-b=m(x-a)
- ax+by=c
