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Geometrical Properties and Formulae for a Triangle

  1. In a triangle the internal bisector of an angle divides the opposite side in the ratio of the arms of the angle, BD/DC = c/d.
  2. In an isosceles triangle the median is perpendicular to the base, i.e., AD  BC.
  3. In similar triangles the corresponding sides are proportional.
  4. The exterior angle is equal to the sum of interior opposite angles.

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