Maths- PC1- co-ordinate geometry

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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