op I 2 p.38 . Sector...
http://lila-erc.eu/data/lexicalResources/NLW/id/attestation/34017 <http://www.w3.org/nl/lemon/frac#Attestation>
op I 2 p.38 . Sector...
op I 2 p.38 . Sector BAD maior semicirculo ad suum trapetium CBAD est ut totus arcus ad cordam BD, sive {004105.}semiarcus AB ad semicordam BE.