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Analytic geometry

Also refer to Maths notes

Analytic geometry
(also called Co-ordinate geometry)		Description
Length of a straight line, and formula for a circle.An explanation of why the formula for the length of a straight line is as it is.  This is then used to show how the equation of a circle comes about.
Slopes of perpendicular linesAn explanation of the relationship between the slopes of perpendicular lines.
GeoGebra interactive toolsDescription
Slopes of perpendicular linesThe GeoGebra file used in the related lessons above.