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# Title: Leibniz-Handschriften zur Mathematik LH 35, 1, 11
# Folio 14v, page id 00067970:0028
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A. C.B. A. B
85) Si duobus in tractu punctis manentibus
A. D
immotis, moveatur ipse tractus linea quam
punctum in eo mo ejus motum describet
dicetur circularis. An autem possit
 tractus aliquis moveri duobus punctis
manentibus immotis, etiam non sumendum,
sed demonstratione definiendum est.
A. C. B. _ A. V. B erit dicetur
e
 co Y linea circularis. et
b
si sint quotcunque puncta. C. D. E. F situe
A. B. C y A. B. D 8 A. BEy Ap dicentur esse
Haec
in una eademque circulari
definitio lineae circularis non praesupponit dari rectam et
planum aut lineam rectam. Quod facit
illo Enclidis definitio
86). Si sit BG A. C
ducere per punctum AC. lineum cdX,
ita ut sit  Z. B 8 L. C. Hoc
fit si punctis A. B immotis per C. describatur
Linea cirncularis Sed idem fieri potest
etiam aliis lineis descriptis iItaque
(86.) Locus omnium punctorum
quae eodem modo se habent ad duo puncta A. . quem admodum ad B.
appellabitur planum. Sive
sisit si sit A A et YB
A. Y. 8 B. X. erit Y) planum.
(87) Linea circularis est in
plano. Hinc si sit Y linea circularis
descripta a puncto sit A. C. B g A. Y. B.
sitque A. C ∞ Y C. B. (adeoque et
A. Y. e B. Y.) erit Linea EoZ circularis
in plano.
An autem omnis circularis
sit in plano postea definiendum est.
88) Locus omnium punctorum
sint a ABG BCG AC.
sitque _ A. Y. Y B.Y. y C. Y. erit
cor. Seu Linea Recta
(89) Si sit, A. V. C A. (X.) erit
vee Y colidum quod dicitur C
superficies Sphaerica
(90) si sit A Y. 8 b. F.