File:Philippe van Lansberge 1604 QED.png

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Philippe_van_Lansberge_1604_QED.png (648 × 180 pixels, file size: 50 KB, MIME type: image/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

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Date/TimeThumbnailDimensionsUserComment
current00:56, 13 January 2008Thumbnail for version as of 00:56, 13 January 2008648 × 180 (50 KB)wikimediacommons>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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