Clavius, Christoph, Geometria practica

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189159LIBER QVARTVS.
Hanc praxim, ſiueregulam, quæ exquiſitiſsima eſt, vt dixi, ita in triangu-
5858[Handwritten note 58] lo A B C, demonſtrabimus.
Diuiſis angulis A B C, A C B, bifariam per rectas
BD
, CD, coeuntes in D, ducantur ex D, ad ſingula latera perpendiculares D E,
DF
, DG, iungatur que recta AD.
Quoniamigitur duo anguli E, D B E, in trian-
gulo
DEB, æquales ſunt duobus angulis G, D B G, in triangulo DGB, &
latus
DB
;
commune; erunt tam latera DE, DG, quam BE, BG, æqualia. Eodemq; 1126. primi. modo tamlatera DF, DG, æqualia eruntin triangulis DFC, DGC: acproinde
DE
, DF, (cum vtraque ipſi D G, ſit oſtenſa æqualis) inter ſe æquales erunt:
ideo-
que
omnes tres perpendiculares DE, DF, DG, æquales inter ſe erunt.

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