Normal form (perpendicular distance) (Origin to line perpendicular length p; α is angle that perpendicular)

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Origin to line perpendicular length p; α is angle that perpendicular makes with +x.

What each symbol means

SymbolWhat it stands for
pLength of perpendicular from origin to line
αAngle of that perpendicular with +x axis

When to use this

p ≥ 0; line not through origin gives p>0.