See Formula Nomenclature

See Slope

A line is determined by two points, x1,y1,z1 and x2,y2,z2.


Distance: \large%20\ D= \begin{pmatrix}\frac{y_2-y_1}{x_2-x_1}\end{pmatrix}\cos a


Distance: \large%20\ D= sqrt[(x_2-x_1)^2+(y_2-y_1)^2]


Midpoint distance: \large%20\ (x,y)= \begin{pmatrix} \frac{x_1+x_2}{2}, \frac{y_1+y_2}{2}\end{pmatrix}


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