{"book":"adl0131","page":39,"text":"کتاب\n۲۸\nمساحه\n\nتقسیم میشود-نقطه ب را مرکز تصور نموده بر کدام نصف قطر انقسم زاویه\nکه خطاب الف را بر نقطه د و ب ج را بر نقطهٔ ی قطع کند باز\nنقاط د و ی را علیحده علیحده مرکز تصور نموده اینچنین دو قوسی\nبرکافی نصف قطر بکشید که یکدیگر را بر نقطه ف قطع کنند یکجا کنید خطاب د\nپس زاویه الف ب ف برابر خواهد بود بزاویهٔ ج ب ف\nتثلیث زاویه قائمه بکنید- فرض کنید که الف ب ج زاویه قائمه است\nنقطه ب را مرکز فرض نموده\nبر نصف قطر دائره بکشید که خط ب الف را بر نقطه د و خط ب ج را برنقطه\nی قطع کند باز خطوط د و ی را مرکز تصور نموده بر همین نصف قضا\nکه اول گرفته شده بود و قوس بکشید که قوس دی را بر خطوط غ و ف\nقطع کنند یکجا کنید ب غ و ب ف را پس از خطوط ب ف و ب غ\nتثلیث زاویهٔ الف ب ج خواهد شد\n۴۲- متوازی یک خط مستقیم یک دیگر خط مستقیم بر بعدمعلوم بکشید\n\nفرض کنید","chars":740,"image":"https://storage.googleapis.com/adl-page-images/adl0131/00039.jpg","first_page":1,"last_page":381,"title":"Kitāb-i ʻIlm i masāḥat کتاب عالم ا مساحت","permalink":"https://afghanpress.org/book/adl0131/39","canvas":"https://afghanpress.org/iiif/adl0131/canvas/39","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."}}