Clavius, Christoph, In Sphaeram Ioannis de Sacro Bosco commentarius

Table of figures

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12083Ioan. de Sacro Boſco. turq́ue rectangulum B E F C, quod erit duplum trianguli A B C; Item duplũ
1141. primi. rectanguli A D B E.
Quare rectangulum A D B E, quod nimirum continetur
2236. primi. ſub perpendiculari A D, &
dimidio baſis B D, æquale eſt triangulo A B C. Di
uidat
ſecundo perpendicularis A D, baſim B C, non bifariam, uel etiam ca-
dat
in baſim C B, protractam, ut in 2.
& 3. figura; Et per A, ducatur rurſus
A
F, in utramque partem æquidiſtans rectæ B C, compleaturq́ue rectangulũ
A
D C F.
Diuiſa deinde B C, bifariam in G, ducantur rectæ B E, G H, ipſi
A
D, æquidiſtantes, eritq́ue G H, æqualis perpendiculari A D.
Quoniam igi-
3334. primi. tur rectangulum B C E F, duplum eſt trianguli A B C;
Item duplum rectangu
4441. primi. li B E H G;
erit rectangulum B E H G, quod continetur ſub perpendiculari
5536. primi. G H, uel A D, &
dimidio baſis B G, æquale triangulo A B C. Area igitur cu-
iuslibet
trianguli æqualis eſt, &
c. quod erat oſtendendum.

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