Ptolemy's theorem
Not superfluous.
(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.
(law, neologism) perspective that emphasizes ordinary people's agency to recognize rights and influence legal interpretation
An underclassman of any gender.
幾何学の授業で、円に内接する四辺形において対角線の長さの積が対辺の長さの積の和に等しいという定理（プトレマイオスの定理）を使って対角線の長さを求めました。
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DiQt
Free
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