{"book":"adl0946","page":253,"text":"۲۴۶\n\nنیز با هم موازی میباشند و شکل مفروض متوازی الاضلاع\nاست پس می توانیم بگوئیم.\nقضیه - شرط لازم و کافی برای انکه يك چهار ضلعی\nمتوازی الاضلاع باشد انست که اضلاع مقابل ان دو\nبدو با هم مساوی باشند.\n۲۸۱ - مسئله - در ذو اربعة اضلاع محدبی دو ضلع\nمقابل با هم مساوی و موازی اند تحقیق کنید چه\nشکل است.\nذو اربعة الاع محدب\nا ج د ن مفروض است\nکه در آن دو ضلع ا ج و د ن\nبا هم موازی و مساویند (سر ۱۹۷) قطر ا د را رسم می کنیم\nدو مثلث ا د ج و ا د ن با هم مساویند زیرا که دو ضلع ا ج\nو د ن بنا بر فرض مساویند و در ضلع ا د نیز مشترکند\nو دو زاویه ج^ ا د و ا^ د ن چون متبادله داخله اند مساویند\nس ۱۹۷","chars":578,"image":"https://storage.googleapis.com/adl-page-images/adl0946/00253.jpg","first_page":1,"last_page":327,"title":"Handasah-ʼi musaṭṭaḥah barā-yi ṣinf-i haftum-i makātib-i rushdīyah, bi-qarār-i prūghram-i Vizārat-i Jalīlah-ʼi Muʻārif-i Afghānistān هندسۀ مسطحه :هندسۀ مسطحه","permalink":"https://afghanpress.org/book/adl0946/253","canvas":"https://afghanpress.org/iiif/adl0946/canvas/253","source":"https://afghanistandl.nyu.edu/books/adl0946/","source_pdf":"https://afghanistandl.nyu.edu/pdf/adl0946_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."}}