# Euclid, Book 3, Proposition 22

Requires a Wolfram Notebook System

Interact on desktop, mobile and cloud with the free Wolfram CDF Player or other Wolfram Language products.

Requires a Wolfram Notebook System

Edit on desktop, mobile and cloud with any Wolfram Language product.

Euclid's Proposition 22 from Book 3 of *The Elements* states that in a cyclic quadrilateral, opposite angles sum to 180°.

Contributed by: Jon Perry (March 2011)

Open content licensed under CC BY-NC-SA

## Snapshots

## Details

detailSectionParagraph## Permanent Citation

"Euclid, Book 3, Proposition 22"

http://demonstrations.wolfram.com/EuclidBook3Proposition22/

Wolfram Demonstrations Project

Published: March 7 2011