Part of ALG-02 — Complex Numbers

Geometry in the Argand Plane

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Key geometric formulas:

  • Distance between z1 and z2: |z1 - z2|
  • Midpoint of z1, z2: z1+z22\frac{z1 + z2}{2}
  • Centroid of triangle: z1+z2+z33\frac{z1 + z2 + z3}{3}
  • z1, z2, z3 are collinear iff |z1 z1-bar 1; z2 z2-bar 1; z3 z3-bar 1| = 0

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