Clavius, Christoph, Geometria practica

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388360GEOMETR. PRACT.
THEOR. 11. PROPOS. 29.
1. Arcvs tres FA, AB, BG, ſextæ partes circuliſunt, quod rectæ eos ſubtẽ-
dentes
ſemidiametri ſint circuli FABG, ex conſtructione.
Igitur FABG, ſemi-
280[Figure 280]1131. tertij. circulus eſt, cuius diameter FG;
ideoque 22ſchol. 27.
tertij
.
FEG, in ſemicirculo rectus:
Et diameter F G, re- ctæ AB, parallela, ob arcus A F, B G, æquales. Et
quoniã
, vt conſtat ex demonſtratione praxis ſcho-
lij
propoſ.
@0. & 11. lib. 1. Euclid. recta C D, ſecat re-
3329. primi. ctam AB, bifariam in M, &
ad angulos rectos; ſe- cabit eadem parallela quoque F G, ad angulosre-
44ſchol. 27.
tertij
.
ctos in C.
Eadem quoq; CD, ſecabit arcum A B, bifariamin E, ac propterea toti arcus EF, EG, ęqua
556. quanti. les erunt, videlicet quadrantes;
ideoq; rectæ EF, EG, latera ſunt quadrati in circulo F A B G, deſcri-
66ſchol. 34.
primi
.
pti, eiuſque diameter FG.
Igitur anguli F, G, ſemi- recti erunt: ac proinde cum anguliad C, recti ſint,
7732. primi. erunt quo que O E M, NEM, ſemirecti;
ideoq; & EOM, ENM, ſemirecti. Ac proinde tam latera E M, N O, quam E M, M N, 886. primi. qualia: atqueidcirco & OM, NM, inter ſe æqualia erunt; nec non & totæ OB,
NA
, æquales erunt.
Immo & EO, EN, erunt æquales, quod latera EM, 994. primi. laterib. EM, MN, æqualia ſint, cõprehendãtq; angulos æquales, vt pote rectos.
2. Deinde quialatera AN, AI, lateribus BO, BH, æqualia ſunt; ſuntq; an-
guli
N, O, ſemirecti æquales, &
vterque reliquorum angulorum I, H, minorre-
101019. primi. cto;
quod vterque minor ſit ſemirecto ad O, & N; propterea quod tam latus AN, minus eſt latere AI, ꝗ̃ latus B O, latere BH: eruntper ea, quæ ad finem lib.

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