Clavius, Christoph, Geometria practica

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IV.
Mvltiplicentvr diametri, vel circumferentiæ, aut latera homologa
in
ſe, &
numeri producti in vnam ſummam colligantur. Radix enim quadrata
huius
ſummæ erit diameter, circumferentiaue, aut latus homologum quæſitum.
Verbigratia, ſi ſint quatuor diametri, circumferentiæue circulorum, autlatera
homologa
ſimilium figurarum, ſimiliter que poſitarum, 84.
3. 4. 12. atq; in ſe mul-
tiplicentur
, gignentur numeri 7056.
9. 16. 144. quorum ſumma 7225. Radix er-
go
quadrata huius ſummæ 85.
erit diameter, circumferentiaue circuli, aut latus
homologum
, quod quæritur:
ita vt circulus, cuius diameter, vel circumferen-
tia
eſt 85.
autfigura ſupra rectam 85. ſimilis, ſimiliterq; poſita figuris datis, æqua-
lis
ſit quatuor circulis, aut figuris propoſitis.
Nam cum quadratum 7225. radicis
112. duodec. 85.
æquale ſit quatuor quadratis 7056. 9. 16. 144. radicũ 84. 3. 4. 12. Circuli au- tem eandem habeant proportionem, quam quadrata diametrorum: ac proin-
de
quam quadrata circumferẽtiarum;
quod circumferentiæ diametris ſint pro-
portionales
.
Item figuræ ſimiles, ſimiliter que poſitæ inter ſe ſint, vt quadrata
laterum
homologorum, propterea quod tam quadrata, quam figuræ 2220. ſexti. duplicatam proportionem laterum:
erit quo que tam circulus, cuius diameter,
circumferentiauẽ
85.
æqualis quatuor circulis, quorum diametri circumferen-
tiæue
84.
3. 4. 12. quam figura ſupra latus 85. ſimilis ſimiliter que poſita, quatuor
figuris
, quarum lateta 84.
3. 4. 12. æqualis, quod eſt propoſitum.

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