Examples: finding missing coordinates of vertices of polygons, determining properties of polygons given the coordinates of their vertices, determining perpendicularity of sides of a polygon on a coordinate plane
 

Methods for proving using general coordinates
This site offers instruction on how to set up a convenient coordinate system and prove using coordinate geometry.

5 Coordinate Geometry Proofs
Here are five proofs that call on various aspects of coordinate geometry.

Coordinate Proof Examples
These examples from Glencoe offer instructions in proving ideas about polygons using coordinates.
 

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