Special Cases of Apollonius' Problem - Rules of Euclidean Constructions

Rules of Euclidean Constructions

In Euclidean constructions, five operations are allowed:

  1. Draw a line through two points
  2. Draw a circle through a point with a given center
  3. Find the intersection point of two lines
  4. Find the intersection points of two circles
  5. Find the intersection points of a line and a circle

The initial elements in a geometric construction are called the "givens", such as a given point, a given line or a given circle.

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