{"book":"adl0131","page":87,"text":"کتاب ۷۶ مساحت\n\nی الف ف و ی و الف متشابه مثلثها اند و ی و را بای الف بهما نسس\nکه ی الف را بای ف است.\nی و * ی ف - ی ا * ی ۲ و نیز موافق دفعه (۶۸) د * وا\n- الف د * د ب در باب مذکور ذکر استعمال همین دو مفید و اکا\nنتیجه ها است برای آسانی از نتایج مذکور قواعد ساخته در ذیل بیان\nمگر اشخاصی که نتایج مذکور را فهمیده باشند برای آنها یاد کردن\nمذکور چندان ضروری نیست.\n(۸۰) ارتفاع قوس و وتر نصف قوس معلومند پس قطر دا\nرا دریافت کنید.\n\nقاعده\nمربع و تر نصف قوس را بر ارتفاع قوس تقسیم کنید خارج قسما\nقطر دائره مطلوب خواهد بود.\n(۸۱) تمثیلات","chars":523,"image":"https://storage.googleapis.com/adl-page-images/adl0131/00087.jpg","first_page":1,"last_page":381,"title":"Kitāb-i ʻIlm i masāḥat کتاب عالم ا مساحت","permalink":"https://afghanpress.org/book/adl0131/87","canvas":"https://afghanpress.org/iiif/adl0131/canvas/87","source":"https://afghanistandl.nyu.edu/books/adl0131/","source_pdf":"https://afghanistandl.nyu.edu/pdf/adl0131_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."}}