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# Title: Wherein the chief Causes of Error and Difficulty in the Sciences, with the Grounds of Scepticism, Atheism, and Irreligion, are inquir'd into (shelfmark Leibn. Marg. 52)
# Folio 24, page id 797331344:0036
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24
Introduction.
cd. To Which P ansiver, thac tho thc
Idea T hare in view Whilst I makee che
Demonstration bc, For instance, that ot
an TCOsceles, Rectansular Friangle whole
Sides arc ot a determinate Lenoch, 1
mar nevertheless be certam it extends
co aIl ocher Rectilincar Triansles, ot
Whac Sorc or Bignels loerer. And that.
Decause neither the ristu Angle, nor thc
egualier, nor determinate Lengch ofthe
Sides are ac all concern d in the Demon-
p
Stration. Lis truc, theDiagram Phare in
vie includes all thesc Parciculars, buc
then theres noc che lcast mention made
et em in che ProOt ot the Propolition.
Ic is noc said the thrcc Angles arc cqual
totroriohtOnes, becaule onc otthemis
a righe Anele, or because thesidescom-
prehending ic arc ot che lame Lengch.
Which Culfciener BeWws chac che righe
Angle mighe have been Oblique, and
ehe Sides unequal, and for all that the
Demonstration hare held good. And
For chis realon ic is, thac I conclude thac
co bc truc ot any Obliquangular or
Scalenon, Which T had demonstraced ot
a parcicular Righe ansled, Eguicrural
Triansle