Ptolemy's theorem
(geometry) A theorem that states in a cyclic quadrilateral, the product of the lengths of its diagonals is equal to the sum of the products of the lengths of the two pairs of opposite sides.
Not superfluous.
(law, neologism) perspective that emphasizes ordinary people's agency to recognize rights and influence legal interpretation
An underclassman of any gender.
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DiQt（ディクト）
無料
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