Retrieving "Vertex (geometry)" from the archives

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1. Semi Major Axis

   Linked via "vertices"

   $$PF1 + PF2 = 2a$$
   The semi-major axis/) is thus half of this constant sum. It is the longest radius of the ellipse, extending from the center to the vertices/) (the points farthest apart). Conversely, the shortest radius, the semi-minor axis ($b$)/), extends from the center perpendicular to the major axis to the co-vertices. These two parameters, along with the distance from the [center](/entrie…