{"book":"adl0131","page":20,"text":"کتاب\n9\nمساحت\n\nفرض ست که خیال مساوات\nزاویه ها را بخوب طرح ذهن نشین\nخود کند و این امر به این چنین مشاهده خوب ذهن میشود که دو زاویه برابر\nاز کاغذ ساخته بر یک دیگر مانده به بیند که آنها منطبق میشوند اما نظریات هندسه\nاین چنین طریقه ها بعمل آورده میشوند که مساوات زاویه ها بغیر بر یک دیگر ماندن ثابت\nمیشود-\n۷ - اگر بشکل دفعه پنجم فرض کرده شود- که زاویه ف ی غ برابر زاویه\nغ ی ج ست پس همه زاویه ی ف ج را دو چند زاویه ف ی غ\nخواهند گفت- و همین چنین باید فهمید که با سه چند و چهار چند و غیره زاویا\nچه مرادست\n۸- اگر یک خط مستقیم بر دیگر خط مستقیم واقع شده زاویه های\nمتصل برابر پیدا کند پس از ان زاویه های متصل هر یک زاویه قائمه\nمیگویند و خط مستقیم را که بر دیگر خط مستقیم واقع ست عمود می نامند-","chars":682,"image":"https://storage.googleapis.com/adl-page-images/adl0131/00020.jpg","first_page":1,"last_page":381,"title":"Kitāb-i ʻIlm i masāḥat کتاب عالم ا مساحت","permalink":"https://afghanpress.org/book/adl0131/20","canvas":"https://afghanpress.org/iiif/adl0131/canvas/20","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."}}