Full text: Clavius, Christoph: Christopheri Clavii Bambergensis ex Societate Iesv In Sphaeram Ioannis de Sacro Bosco commentarius

70. III.

Centrvm figuræregularis dicitur punctum illud, quod centrum
eſt circuli figuræi@ſcripti, uel circumſcripti.

71. IIII.

Area cuiuslibet figuræ dicitur capacitas, ſpatium, ſiue ſuperficies in-
tra lateraipſius comprehenſa.

72. V.

Omne ſolidum rectangulum (cuius nimirum baſes æquidiſtantes
ſunt, & æquales, latera{q́ue} ad baſes recta, quale eſt Parallelepipedum) con-
tineri dicitur ſub altera baſium, ac perpendiculari ab illa baſi ad alteram
protracta.

Qvia nimirum altarutra baſium indicat longitudinem, ac Iatitudinem fi-
guræ, perpendicularis vero altitudinem, ſiue profonditatẽ eiuſdẽ demonſtrat.

73. THEOR. 1. PROPOS. 1.

ARea cuiuslibet trianguli æqualis eſt rectangulo comprehen-
ſo ſub perpendiculari à uertice ad baſim protracta, & dimidia
partes baſis.

73.1.

Triangulũ
quodcun q;
eui rectan-
gulo ęqua-
@ ſ [?] it.

Sit triangulum A B C, ex cuius uertice A, ad baſim B C, ducatur per-
pendicularis A D, diuidatq́ue primò baſim B C, bifariam, ut in prima figura. Per A, ducatur E A F, in utramque partem æquidiſtans rectæ B C, complea-

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