# Line

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