Created by evie.daines
over 10 years ago
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Perpendicular/ normal gradient=M1xM2=-1
y-y1=M(x-x1)
y2-Y1--------X2-X1
Midpoint=Y1(X1) + Y2(X2)----------------------- 2
Tangent follows the line.
Proving something is a right angle use the perpendicular gradient
Distance between two points. Draw out the triangle and work out the distance from x and the distance from y and use the formulae: X^2+Y^2= C^2
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