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# Title: Qua Continentur De Angulo Contactus & Semicirculi, Disquisitio Geometrica. De Sectionibus Conicis Tractatus. Arithmetica Infinitorum: sive de Curvilineorum quadraturâ, &c. Eclipseos Solaris Observatio (shelfmark Leibn. Marg. 84:2)
# Folio 90, page id 824573315:0174
# Original at the GWLB: https://digitale-sammlungen.gwlb.de/resolve?id=824573315&page=174
# Source image: https://digitale-sammlungen.gwlb.de/content/824573315/jpgs/default/00000174.jpg
# Model: FoNDUE-GD_v2_ft_Leibniz, run 74, 2026-09-06T16:05:13Z — 5 lines, status machine
# Lines: 5 recognised, mean confidence 0.75
# Machine transcription. Not an edition. Errors are expected: about 8% character error rate on Latin and French lines, higher on German.
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# Wording rule: say "the machine reads it as …", never "Leibniz wrote".
# After the first blank line: the recognised lines in reading order, one per line.

2 - x Y
De Sectionibus Conicis. PROP. 37.
- = 4. Ec rectangulum D A + D a 
O
2d2