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Perfpeétiv~

quod diagonalibus AC, BD divides,

&

ubi diago–

nales fecant circulum, duces lineas latcribus pa–

rallelas. Hoc quadramm (

per pruedentem )

cum

Cuis divilionibus perfpcél:ive dcfcribe , ducen–

do diagonales BG, AF, duc ítem radios

1E, OE,

KE, qua: diag(;males fccabum in punél:is pcr qua:

circulus tranlit,conjunges hzc punéla linea curva.

G

Demonfhatio fatis per

fe

patct , cum cnim

defcriptio quadrati , cum íua diviíione

lit

jam

demonll:rata , dcmon{hamur punél:a interícél:io–

num penincre ad circulum ; ducatur ergo cir–

culus pee

lineam curvam conneél:entcm pun–

ll:a ad illmn peninemia ; ha:c erit eius appa·

rentia.

l1:!1lll.ll1:!1l1:!1l!!l·l1:!1!!!ll1:!1rtlll1:!1r!iil1.!1l1:!1!Jll!'lfll1:!1l1:!1lll.ll1:!1l1:!1llil.lll.l11.!1!!1ll1:!1!1!1!!!ll1:!11Ztll1:!1!l:!1lll.ll1:!1llil.l1:!1lll.l~l1:!1llil.l1:!1l1:!1l1:!1!i.íil1:!1llli

P R O P O S I T

I O

V.

Problema.

T riangul111n diftans

a

linea teru. in tabella perJPefliv; delineare.

'.

Sir criangulum duplex ABC delincandum, tan–

tum dill:aos

a

ljnea terra1 quamum dill:at

a

linea

45.Ex

liogulis cius aogulis dcminantur perpendi–

c

ulares ad lincam

4.5,

1;emp~

AA,BB,CC, deinde

!ir

linea AA, a:qualis linez AA, item BB, a:qualis

lincz BB,& linea Ce, .ii:qualís linea:

CC,

transfe-

B

.J

e

ranmr diviliones linea: 4. 5. in lineam temr,lirque

punéh1m L princípale,

&

M

punél:um difiamiz,

ducamr ex C, lineaCL,ad punél:um principale L,

&

ex alio

C

linea

CM,

ad punél:um dill:ant1z

M,

inierfeélio

R

dabit apparenriam anguli

C.

Parí•

ter ex

A,

ducatur linea

AL, ad

punéhlm principa•

I:

L,