Langbahn Team – Weltmeisterschaft

File:Philippe van Lansberge 1604 QED.png

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Summary

Description
English: A 1604 use of "quod erat demonstrandum". Latin text:

8. Sinus rectus peripheriae, et complementi sui aequepossunt radio.

Complementum peripheriae dicimus reliquam datae ad circuli quadrantem. Sit igitur in /
praemissa figura, recta EF, sinus rectus peripheriae GE vel BCE: et complementi sui CE sinus rectus /
ED, vel aequalis illi AF per trigesimam quartam primi elementorum. Dico AF et EF, aequeposse /
radio AE. Nam per penultimam primi Euclidis, in Triangulis rectangulis, quadrata laterum rectum /
angulum continentium, aequalia sunt lateri rectum angulum subtendenti. Sed AFE est Triangulum /
rectangulum ad F per septimam hujus, crura verò rectum ambientia sunt AF et EF: aequepossunt /

ergo radio AE rectum angulum subtendenti; quod erat demonstrandum.
Date
Source Triangulorum geometriae libri quatuor: in quibus novâ ...
Author Philippe van Lansberge

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Public domain

This work is in the public domain in its country of origin and other countries and areas where the copyright term is the author's life plus 100 years or fewer.

This work is in the public domain in the United States because it was published (or registered with the U.S. Copyright Office) before January 1, 1930.

This file has been identified as being free of known restrictions under copyright law, including all related and neighboring rights.

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1604

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current23:56, 12 January 2008Thumbnail for version as of 23:56, 12 January 2008648 × 180 (50 KB)Dicklyon{{Information |Description=A 1604 use of "quod erat demonstrandum" |Source=[http://books.google.com/books?id=fg9KAAAAMAAJ&printsec=titlepage&dq=quod-erat-demonstrandum+date:0-1700&lr=&as_brr=1 Triangulorum geometriae libri quatuor: in quibus novâ ...] |D

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