{"book":"adl0946","page":50,"text":"۴۳\n\nه ج زاویهٔ مفروضه باشد ضلع اه را از آن طرف رأس\nامتداد می دهیم تا ه اَ (الف یک) بدست بیاید از امتداد\nآن زاویهٔ اَ ه ج بدست می آید که مکمل زاویهٔ ج ه ا است\n(مثله) بدین ترتیب\nجواب ج ه اَ بدست\nآمده که در آن یک نقطه\nعلامت می گزاریم\nبجای آنکه ا ه را امتداد\nسر ۵۲\n\nدهیم می توانیم ه ج را امتداد دهیم که ه جَ بدست بیاید ـ و\nازان زاویهٔ ا ه جَ نتیجه می شود که متمم زاویهٔ ا ه ج است\nو آن را هم بواسطه یک نقطه علامت می گذاریم این دو زاویه\nکه یافته ایم باهم مساوی اند زیرا واضح است که فقط یک زاویه\nمی توان یافت که چون بر زاویهٔ ا ه ج افزوده شود ۸۰ ا درجه\nگردد - این دو زاویهٔ وضع مخصوصی بیکدیگر دارند یعنی اضلاع\nشان در امتداد یک دیگرند این چنین زوایا را متقابل براس","chars":656,"image":"https://storage.googleapis.com/adl-page-images/adl0946/00050.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/adl0946/50","canvas":"https://afghanpress.org/iiif/adl0946/canvas/50","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."}}