CK12 - Geometry

This can be examinedon a coordinategrid by findingthe slopeof the diagonals.Perpendicularlinesand
segmentswill haveslopesthat are oppositereciprocalsof eachother.

Example 1

Examinethe kite

on the followingcoordinategrid. Showthat the diagonalsare perpendicular.

To find out whetherthe diagonalsin this diagramare perpendicular, find the slopeof eachsegmentand
comparethem.The slopesshouldbe oppositereciprocalsof eachother.

Beginby findingthe slopeof. Rememberthat the slopeis the changein the -coordinateover the
changein the -coordinate.

The slopeof is -1. You can also find the slopeof usingthe samemethod.