Definition of a line
Math Open Reference

Definition of the intersection of two lines
Math Open Reference

Animation showing that in any triangle, the centroid, circumcenter and orthocenter are always collinear  they always lie on a straight line, called the Euler line.
Math Open Reference

CPCTC  a way to remember 'Corresponding Parts of Congruent Triangles are Congruent'
Math Open Reference

Definition of a ray when the defining points are on the coordinate plane
Math Open Reference

A method for finding the distance from a point to a vertical or horizontal line in coordinate geometry
Math Open Reference

A method for finding the distance from a point to a line in coordinate geometry using trigonometry
Math Open Reference

A method for finding the distance from a point to a line in coordinate geometry using a formula
Math Open Reference

A method for finding the distance from a point to a line in coordinate geometry using two line equations
Math Open Reference

Three methods are discussed for finding the distance from a point to a line in coordinate geometry
Math Open Reference
