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Definition of the intersection of two lines

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.

CPCTC - a way to remember 'Corresponding Parts of Congruent Triangles are Congruent'

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

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

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

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

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

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

The coordinate plane defined with description of x,y axis, quadrants, origin.

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