English: The spherical parallelogram ABCD has opposite sides and opposite angles congruent, the two diagonals bisect each-other, and the vertices are all equidistant from great circles passing through the midpoints of opposite sides.
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The spherical parallelogram ABCD has opposite sides and opposite angles congruent, the two diagonals bisect each-other, and the vertices are all equidistant from great circles passing through the midpoints of opposite sides.