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Finding equation of perpendicular bisector between two points
Use this applet to review how to find the equation of the perpendicular bisector between two points using the midpoint and gradient of normal method.
http://www.geogebra.org/en/upload/files/english/lewws/eqnofperpenbisectorsteps_v4.html
Alternate location of applet if the above is not able to run. https://sites.google.com/a/moe.edu.sg/dmnteachgeogebra/geogebra-lessons-pages/perpenbisector
You can use it for classroom demonstration of method or for pupils self directed learning
