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# Title: Erhardi Weigelii Sacrae Caesar. Maiest. ut & Com. Pal. Sultzb. Consiliarii, Supr. Artium Archit. Directoris Saxo Ien. Mathemat. PP. totius Academiae Senioris, Philosophia Mathematica (shelfmarks Leibn. Marg. 65; ZEN Leibn. Marg. 65)
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DE PROPORTIONE
non
COndicramen.
Si alterutra C. d est Diameter Circuli, cui
altera BD. perpendiculariter insistit;
hujus semissis E. B. est media proportio.
nalis inter BA es FC. Vid. FIg. SI.
Subodictamen 4.
puncto . FiB. 52. extra Circulum, per
Circulum duetae rectae AD. AC. cum se-
is suis sunt reciproce proportio
naleS.
DED A. AC :: AB. AF. PTAM EIIS ADB - ACF.
per Subd. r. Prod. 5. Ciap. 5. _ Clus a communis
est. Froo Triangula ABD _ AEC. sunE simi-
lia. Ergo per praeced. ErsorectanB. VAFre.
Ctars: F. AB.
Subdietamen 5.
Si una barum rectarum taneat Circulum
in F dum altera eum secat in L (5 D.
eunc AF. est media proportionalis inter
AF ES AD.
Xtam elus a communis est Prianoulis AFH e
A _ LlUS AFR = FDF, per SuDd, 2. Proc. b.
C.dP. 5. I. hac Triargula Cune simitia. FrSo
t  AF: = AF. ABd.
+4
10