Sanskrit Wikisource: बौधायनशुल्बसूत्रम् (1 page; revision ids 415372, full list in content/corpus/wikisource cache) — The page counts its khaṇḍas from 0; here they are counted from 1 (khaṇḍa.sūtra), so the rule of the diagonal stands at 1.12.
Sanskrit Wikisource (sa.wikisource.org): the texts are public domain; page markup CC BY-SA 4.0. Devanagari as given on the page; IAST generated mechanically.