Cavalieri, Buonaventura, Geometria indivisibilibvs continvorvm : noua quadam ratione promota

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121101LIBER II.
COROLLARIVM.
_E_X hoc habetur ſingula puncta recti tranſitus, vel obliqui, inciden-
tis lineæ, nedum eſſe communes ſectiones illius, &
ſingulorum,
quæ collecta dicuntur, omnia plana propoſiti ſolidi, ſed etiam, ſi per
talem incidentem extendatur planum, eſſe communes ſectiones illius,
&
ſingularum, quæ collectæ dicuntur : Omnes lineæ planæ figuræ, cuius
oppoſitætangentes ſunt communes ſectiones plani eiuſdem figuræ, &

oppoſitarum tangentium dicti ſolidi :
nam motum planum deſignat in
plano ſecante rectam lineam, &
inſimul punctum in ineidente, quod
reperitur in illa recta linea, &
ideò idem punctum eſt communis ſectio
tum moti plani &
rectæ incidentis, tum vnius earum, quæ dicuntur om-
nes lineæ datæ figuræ planæ (ita tamen productæ, vt hanc incidentem ſe-
care poſſint) &
eiuſdem incidentis.
IV.
SI inter alterum extremorum punctorum propoſitæ rectæ
lineæ, &
ſingula puncta, quæ ſimul collecta dicuntur
omnia puncta recti, veleiuſdem obliqui tranſitus eiuſdem,
fumamus interiacentes lineas, dicantur iſtæ ſimul collectæ:
Omnes abſciſſæ propoſitæ lineæ, quas (etiam ſi non expri-
matur) vocari ſupponemus recti tranſitus, ſi puncta ſint recti
tranſitus, vel eiuſdem obliqui tranſitus, ſi puncta ſint eiu-
ſdem obliqui tranſitus.
V.
REctæ lineæ verò in antecedentis deſinitionis propoſita
linea inter eadem puncta, &
reliquum extremorum in-
teria centes, dicentur:
Reſiduæ omnium abſciſſarum propo-
ſitæ lineæ recti tranſitus, ſi puncta ſint rectitranſitus, vel eiu-
idem obliquitranſitus, ſi ſumpta puncta ſint eiuſdem obliqui
tranſitus.

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