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Analytic Geometry - Straight Line in Plane


Straight Line in Plane

 

Poin coordinates: X, Y, X, x0, x1, y0, y1, a1, a2, ...

Real number: k, a, b, p, t, A, B, C, A1, A2, ...

Area: α, β

Area between two lines: φ

Normal vector:

Positive vector: 


  • General Equation of a Straight Line

    Ax + By + C = 0

 

  • Normal Vector to a Straight Line

   The vector  (A, B) is normal to the line Ax + By + C = 0.

 

Figure

 

  • Explicit Equation of a Straight Line (Slope- Intercept Form)

    y = kx + b.

   The gradient of the line is k = tan α.

 

Figure

 

  • Gradient of a Line

     


 

Figure

 

 

  • Equation of a Line Given a Point and the Gradient

   y = y0 + k(x – x0),

   where k is the gradient, P(x0, y0) is a point on the line.

 

 

Figure

 

  • Equation of a Line That Passes Through Two Points

    

Figure

 

 

  • Intercept Form

     


 

Figure

 

  • Normal Form

   x cos β + y sin β p = 0

 

Figure



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Labels: Mathematician

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