Clavius, Christoph, Geometria practica

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202172GEOMETR. PRACT. explorentur in triangulo ABG, duo anguli B, G, ex duobus lateribus AB, A 1112. triang.
rectil
.
angulo que ab ipſis comprehenſo;
atque inſuper latus B G. Hinc enim in tri-
angulo
rectangulo ABH, vel AGH, demiſla perpendicularis ex A, 222. triang. re-
ctil
.
tur ex baſe AB, &
angulo B, vel ex baſe A G, & angulo G: ac proinde area trian-
guli
reperietur, vt antea, exijs, quæ c.
2. huius lib. Nume. 1. & 2. tradita ſunt.
Non aliter area trianguli B C D, nota fiet ex duobus lateribus CB, CD, notis an-
3312. triang.
rectil
. Nu 2.
gulum C, notum ambientibus, ſi nimirum inueſtigentur prius anguli B, D, vna cum latere B D, &
ex his demiſla perpendicularis C K. Poſt hæc in 442. triang. re-
ctil
.
BD G, ſi anguli AB G, CB D, iam cogniti detrahantur ex toto angulo ABC, no-
to
, remanebit angulus D B G, notus.
Cum ergo latera B D, B G, ipſum inclu-
5512 triang.
rectil
. Nu 2.
dentia facta ſint etiam nota;
cognoſcentur eodem modo & anguli D, G, & latus D G; atque in ſuper perpendicularis ex B, in D G, demiſſa, & c. 662. triang. re-
ctil
.
in triangulo GDF, ſi ex angulo noto A G F, tollantur anguli A G B, B G D, iam
noti
effecti, relinquetur angulus D G F, notus.
Cumigitur & latus G D, notum
7712. triang.
rectil
.
factum ſit:
cognoſcemus & duos angulos GDF, GFD, & inſuper latus D F, vna cum perpendiculari ex G, in D F, demiſſa, & c. In triangulo denique DEF,
882. triang.
rectil
.
cum omnia latera ſint nota;
efficientur quoq; noti omnes tres anguli: ac pro- inde demiſſa perpendicularis D M, ex D, demiſſa, vel ex quocunque alio angu-
9916. triang.
rectil
.
lo, nota fiet, &
c. Ex his facile intelliges, quomodo in alijs figuris irregulari- buste gerere debeas.
10102. triang. re-
ctil
.

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