{"book":"adl0290","page":358,"text":"۳۵۱\n\n۱۳۶ مثلث\nهرگاه کدام قطعه زمین شکل مثلث داشته\nباشد طریق مساحت آن این است که یک ضلع\nآن را پیمایش کنید و از راس زاویه مقابل\nضلع مذکور یک عمود بر آن ضلع بکشید و این\nعمود را هم پیمایش کنید *\nبعد ازان عمود را در ضلع معلومه ضرب\nکرده حاصل ضرب را بر ۲ تقسیم کنید خارج\nقسمت مساحت مثلث خواهد بود *\nمثال ۱ یک ضلع مثلث ۱۸ گز است\nو عمودیکه بر آن\nاز زاویه مقابل\nکشیده شده ۲ گز\nمی باشد پس\nمساحت آن را\nمعلوم کنید *\nعمود ۲ گز\nضلع معلوم\nمساحت = ۲x۱۸/۲ = ۱۸ مربع گز = ۲ بسواسه اگر\nمثلث قائم الزاویه با شد عمود آن را","chars":500,"image":"https://storage.googleapis.com/adl-page-images/adl0290/00358.jpg","first_page":1,"last_page":1089,"title":"ʻIlm-i ḥisābعالم حساب","permalink":"https://afghanpress.org/book/adl0290/358","canvas":"https://afghanpress.org/iiif/adl0290/canvas/358","source":"https://afghanistandl.nyu.edu/books/adl0290/","source_pdf":"https://afghanistandl.nyu.edu/pdf/adl0290_download.pdf","rights":{"image":{"statement":"Public domain. NYU states: \"All works presented on this website are, unless otherwise indicated, in the public domain. The images available on this website may be freely reproduced, distributed and transmitted by anyone for any purpose, commercial or non-commercial.\"","uri":"http://rightsstatements.org/vocab/NoC-US/1.0/","holder":"New York University Libraries","source":"https://afghanistandl.nyu.edu/about.html","delivery":"Images are served from a copy mirrored by this project, not from NYU's servers, under the reproduction terms above.","endorsement":"This is an independent project. It is not affiliated with, endorsed by, or reviewed by New York University."},"text":{"statement":"Machine-generated transcription, dedicated to the public domain under CC0 1.0. No warranty of accuracy: see the provenance block on every page.","uri":"https://creativecommons.org/publicdomain/zero/1.0/","holder":"Steps Ventures"}},"provenance":{"text_produced_by":"gemini-3.1-pro-preview","thinking_level":"low","read_completed":"2026-08-09","per_page_confidence":null,"per_page_confidence_note":"Not recorded during the corpus run. No calibrated per-page score exists, and none is estimated here.","human_reviewed":false,"accuracy_context":"Roughly two thirds of characters agree with a modern printed edition of the same text. Much of the disagreement is editorial, not misreading. Treat the transcription as a finding aid and read the page image before quoting.","primary_source":"The page image. The text is an index into it."}}