• Corpus ID: 124622186

# On the Diagonals of a Cyclic Quadrilateral

```@inproceedings{Alsina2007OnTD,
title={On the Diagonals of a Cyclic Quadrilateral},
author={Claudi Alsina and Roger B. Nelsen},
year={2007}
}```
• Published 2007
• Mathematics
We present visual proofs of two lemmas that reduce the proofs of expressions for the lengths of the diagonals and the area of a cyclic quadrilateral in terms of the lengths of its sides to elementary algebra.

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Introduction Part I. Visualizing Mathematics by Creating Pictures: 1. Representing numbers by graphical elements 2. Representing numbers by lengths of segments 3. Representing numbers by areas of