Linked from

The 8 pages that link to Diagonal, each with the reason it gives.

• PolygonBroader topic: Diagonals connect vertices without following the boundary.

• Cyclic quadrilateralRelated: The quadrilateral's diagonals appear in Ptolemy's theorem and divide it into triangles.

• Ptolemy's theoremBroader topic: The theorem links the two diagonals to the products of opposite sides.

• Ptolemy's inequalityRelated: The two diagonals form the left-hand product in the inequality.

• Euler's quadrilateral theoremRelated: The theorem compares the squared lengths of both diagonals with the four squared sides.

• Square root of 2Related: The diagonal of a unit square has length square root of 2.

• Word searchRelated: Diagonal placement expands the directions in which a word may appear.

• Japanese theoremRelated: The two diagonals divide the cyclic quadrilateral into the four triangles compared.