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# Title: Teutsche Algebra/ Oder Algebraische Rechenkunst/ zusamt ihrem Gebrauch (shelfmarks Leibn. Marg. 88, Stück 1; Leibn. Marg. 88)
# Folio 103, page id 827658990:0113
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Necheneuns.
(2, 12, (23 aa + 2ab Fbb cc = dd + 2C. Ul(0 sagt es die propr
1O
Sitiom
Demonstration.
4 22 1 2ab. t bb- dd- ce- 2dc -- DBD
15I CC ce
= _BD
A- - 15 X6 ad + 2ab. t bb dd 2dc- Cc  10
0.  t 2dC 27 2a + 2ab. + bb. cc = -dd t 2dc. Ullerdings Ni
8 serC
dD
40
10- 1I
8312,
I
2
Positionben der r3. Stell mitgebrachthat.
Sach disem schlage Fonten allerhano Beometrisch eHo
positionen demonstriert verden.
AC nu 8
BD. F
glischer Friangels, die sentet und seomentu
finden.
EAB  400
BBC = 225
HAB IBC =-175
9 AC. + CD = 8 L C A1
10 AAD = 64i L. 26C. L CC
11 HICD=
c
+2 GAD-- BCD =64. F T6C
175
= 64 1- 16C
3- 64 X4 +LF == 16C
A 16
Bebrauct Diser Provosition.
AB=20 Qus berantem 3. seiten eines ieden obliquan-
BC  25
4 CDC
6
3
E5
C=CV
8 + C= AD
6400
D AB
d