{"book":"adl0946","page":288,"text":"۲۸۱\nنصف قوس ح دل است چون مجموع این دو قوس تمام دایره\nیا ۳۶۰ درجه است پس مجموع دو زاویه د و ا مساوی ۱۸۰\nدرجه یا دو قائمه است و بهمین دلیل مجموع دو زاویه دیگر ح\nول مساوی با ۱۸۰ درجه می باشد پس در هر ذو اربعة الاضلاع\nمحاطی زوایای مقابل مکمل یک دیگرند -\n۳۱۸ - حال به ببینیم آیا همین شرط برای محاطی بودن\nذو اربعة اضلاع کافی است یا نه پس فرض می کنیم ذو اربعة اضلاع\nا ح دل در دست باشد که در آن دو زاویه ا و د مکمل یک\nدیگرند پس مجموع دو زاویه دیگر دو قائمه است زیرا که مجموع\nزوایای هر چهار ضلعی مساوی با چهار قائمه است (ع ۲۴۵)\nحال دائره رسم می کنیم که بر سر نقطه ا و ح و د بگذرد میگوئیم\nآن دائره بر نقطه ل نیز خواهد گذشت زیرا که زاویه ل مکمل\nزاویه ح است و اگر نقطه ل در خارج یا درون دائره واقع\nشود آن وقت زاویه ل از مکمل زاویه ح کوچک تر یا بزرگ تر\nخواهد گردید پس حتماً نقطه ل روی دائره است و شرط مزبور","chars":793,"image":"https://storage.googleapis.com/adl-page-images/adl0946/00288.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/adl0946/288","canvas":"https://afghanpress.org/iiif/adl0946/canvas/288","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."}}