Clavius, Christoph, Geometria practica

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6060[Handwritten note 60]6161[Handwritten note 61]
ALITER. Sit ducenda perpendicularis ad maximum latus B C, in priori
triangulo
ABC, quæ neceſſario cadet intra triangulum;
propterea, quod 2218. primi. gulus A, maior eſt vtrolibet BC; ac proindevterque horum acutus eſt. 3313. ſecundi. niam autem quadratum rectę A B, minus eſt quadratis rectarum A C, BC, re-
6262[Handwritten note 62]6363[Handwritten note 63] ctangulo bis comprehenſo ſub BC, &
ſegmento CD, inter C, & perpendicula-
rem
:
ſi quadratum rectę AB, 100. detrahatur ex ſumma quadratorum rectarum
A
C, B C, id eſt ex 730.
reliquum fiet rectangulum 630. bis comprehenſum
ſub
B C, &
ſegmento CD, inter C, & perpendicularem. Quare eius ſemiſ-
ſis
315.
æqualis erit rectangulo illi ſemel ſumpto: ac proinde hoc rectangu-
lo
315.
diuiſo per latus B C, 21. dabit Quotiens 15. ſegmentum C D, prope
angulum
acutum C, cui opponitur latus A B, cuius quadratum ex ſumma
reliquorum
quadratorum detractum fuit.
Ablato autem ſegmento C D, 15.
ex latere B C, 21. remanebit alterum ſegmentum B D, 6. Eodem pacto, 4413. ſecundi. quadratum rectę A C, minus eſt quadratis rectarum A B, B C, rectangulo
6262[Handwritten note 62]6363[Handwritten note 63] bis comprehenſo ſub CB, &
ſegmento B D, inter B, & perpendicularem: ſi
quadratum
rectę A C, 289.
ſubducatur ex ſumma 541. quadratorum recta-
rum
A B, B C, reliquum fiet rectangulum 252.
comprehenſum bis ſub C B,
&
ſegmento B D, inter B, & perpendicularem. Quare eius ſemiſsis 126. æ-
qualis
erit illi rectangulo ſemel ſumpto:
ac proinde hoc rectangulo 126. di-
uiſo
per latus CB, 21.
dabit Quotiens 6. ſegmentum BD, iuxta acutum angu-
lum
B, cui latus A C, quadrati ex duobus aliis quadratis detracti opponitur.

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