{"book":"adl0946","page":257,"text":"۲۵۰\nباید ملتفت بود که اگر نقطه متناظره راس ج از مثلث ا د ج را نسبت\nبه نقطه ء وسط قاعده اش پیدا کنیم (س۹۹) شکل متوازی الاضلاع\nا ج د ن بدست می آید این ترسیم در مسائل مربوط به میانه ہائے\nمثلث بسیار بکار می رود۔\n\nمتوازی الاضلاعهای مخصوصه\n۲۸۶ مستطیل - هرگاه یکی از زوایای متوازی الاضلاعی\nقائمه بشود انزاویه مقابل آن هم قائمه می شود اما دو زاویه دیگر که آنها\nنیز باهم مساویند و مجموع شان دو قائمه است هر دو قائمه می گردند\nپس چهار زاویه متوازی الاضلاع قائمه است.\nتعریف - مربع مستطیل متوازی الاضلاعی است\nکه تمام زوایای ان قائمه است .\n۲۸۷ - تناظر مستطیل - مربع مستطیل ا ج د ن مفروض\nاست (س۱۰۰)\nدو نقطه‌ك و ل وسط دو ضلع مقابل ا ج و ن د را","chars":627,"image":"https://storage.googleapis.com/adl-page-images/adl0946/00257.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/adl0946/257","canvas":"https://afghanpress.org/iiif/adl0946/canvas/257","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."}}