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Liber

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PROPOSITIO

XIII.

#,Itera correaio a11g11li

t111Uti~

Sit corrigendus angulus acutus BAC.Formen–

mr duo femipropugnacula E ,

&

D ,

&

forceps

DFE cui opponacur parmula ut vides in figura,

:i..

Pro femipropugnaculis , integra propug–

nacula adhibeancur,

&

angulus acucus A in par–

mulam efformetur.

_ Hujus correéHonis varia funr excmpla,

1Jer–

gopfa11

calem exhiber,

,

• Poffunt

ic.~ ~fitrpari

femipropugnacula con–

¡unll:a ,

ut

vides m

IKL

,

punél:um tamen

K

dc-

'[_om!

! [

l!

·

IV:

·5 -

.

7

f~nlione

caree, ideoque fatius foret, ut parva cor•

b~da, ~u';'MduNobOus

prolpRugnacu\is ufurparecur ' ut

v1

es

m "'

,

ve

STV.

fllll!i!,¡¡¡¡¡¡¡¡1l!i.1l!ilfllllllN!el!N!llil1l!it¡:¡¡l)ijlll\,llill!ll¡¡¡¡!!!!•ll:i

PROPOSITIO

XlV.

T

ertia correélio .Anguli amti.

Cum :mgulus aCL1tus omnino ineptus

lit

mu~

nitioni, hanc adjicio corrcél:ionem. Dixi Íupra

angulum polygoni íalcem

60

graduum ,

pofíe

murari in angulum defenfum lcu propugnaculi,

quod nonnunquam facile perfici po<e!l-. U<

li

gulus ABC 1concinerec

60

gradus, alfumpcis

fa–

ciebus BD, B..E circirer quinquaginra exapedarnm

duo propngnacula defcribo in A ,

&

C , produ..:

él:ííque eormn faciebus in F,

&

G excito perpen–

diculares GD, FE

1

cum disjicio muros

El,

DH,

habencurque cortina: non reél:a:.

11.!l!!!l'!l!l,N!llll1J:1!!!111l!i1l!i1'1lW!fll1J:1!!1:2.!l'llll1!!l"ll!!!l1l!ilillll!J

PROPOSITIO

XV,

Prima correél:io a11g11li interni,

Angulus incernus facilc corrigirur ,

li

disjlé{

commodc pocefi. Si enim balis ejus AC non ex-

cedat latus polygoni, facilis éric correaio'

íl

nempe ducamr linea AC. Si vero linea AC urnl·

tum exccdcret lacus imcrnum poiygoni , ur

li

du–

ccnras

cx~pedas

conrineret , angufus exrernus

CAD, pro interno ABC fiibflicuendus, foret

~

atqne ita mimitionis area fierec major,

&_

anguh

FCD, EAD fierenc municioni accomodanores.

Denique li linea AC contineret

i 65

exap7das,

tria latera fupra AC coníliruenda elfenr, ut

mfr~

fom explicaturus , cum de fubccnlis agam,

...1

íj

PROPO