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Cartesian equation:
if vertex at (5,0)..........>......vertices are at (5,0) and
(-5,0)
if co-vertx at (0,-3).........>......co-vertices are at (0,-3) and (0,3)
: semi-major axis length
major axis length 2a=10.......>...... : semi-minor axis length
minor axis length 2b=6.................>......