{"book":"adl0946","page":259,"text":"۲۵۲\n\nعمودند و هرکدام نیز با دو ضلع مقابل موازیند.\nفرض می کنیم ه محل تقاطع دو محور تناظر باشد از ان نقطه بنقاط\nا و ج و د و ن وصل می کنیم منصف زاویه ج ه ک خط\nه ك است (۱۳۹) و همچنین منصف زاویه ا ه ك خط\nه س می باشد چون این دو منصف الزاویه برهم عمودند-\nپس مجموع دو زاویه ج ه ك و ا ه ن دو قائمه است و چون\nاین دو زاویه مجاوره اند پس اضلاع خارجی آنها بر استقامت\nیک خطند و نقطه ه بر روی قطر ج ن است و بهمین طریق\nثابت می کنیم که نقطه ه بر روی قطر ا د نیز می باشد پس\nاین نقطه مرکز تناظر مستطیل است (۲۸۳) و می توانیم\nبگوئیم :\nقضیه - هر مستطیل دارای دو محور تناظر است\nکه بر اضلاع آن عمود میباشند و هر دو از مرکز\nآن میگذرند.\n۲۸۸ - بسهولت بدو شکل می توان ثابت نمود که","chars":652,"image":"https://storage.googleapis.com/adl-page-images/adl0946/00259.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/adl0946/259","canvas":"https://afghanpress.org/iiif/adl0946/canvas/259","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."}}