Steiner's theorem

Steiner's theorem

[′shtīn·ərz ‚thir·əm]
(mechanics)
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Application of Steiner's Theorem for Trapezoids --Geometric Constructions Using Straightedge Alone.
However, the segment FN that passes through the midpoints of the trapezium's bases, the meeting point of the diagonals and the meeting point of the trapezium's continuations of the sides, immediately reminded the authors of Steiner's theorem, which in fact states the results of the problem above.
On the other hand, from Steiner's theorem, in trapezium ABPQ the line [X.