Math Formulas: Lines in two dimensions

Line forms

Slope y-intercept form:

Two point form:

Point slope form:

Intercept form

Normal form:

Parametric form:

Point direction form:

where (A,B) is the direction of the line and lies on the line.

General form:

Distance

The distance from to is

Concurrent lines

Three lines

are concurrent if and only if:

Line segment

A line segment can be represented in parametric form by

Two line segments and intersect if any only if the numbers

satisfy

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