{"book":"adl0131","page":21,"text":"کتاب\n۱۰\nمساحت\nمثلاً در شکل اگر زاویه الف ب ج برابر زاویه الف ب د است پس\nهر یک را زاویه قائمه میگویند و خط الف ب بر خط ج د عمود ست\nزاویه منفرجه آنرا گویند که از زاویه قائمه کلان باشد زاویه حاده آنرا گویند\nکه از زاویه قائمه خورد باشد\n۹ خطوط متوازیه خط‌های مستقیم را گویند که در یک سطح واقع باشند\nو آنها را بهر دو طرف خواه هر قدر دراز کنیم باهم هرگز یکجا نشوند\n۱۰ شکل مستقیعة الاضلاع آن شکل را گویند که با خطوط مستقیم احاطه\nکرده شده باشند و حدود شکلی را بنام اضلاع موسوم میکنند\nمثلث آن شکل مستقیمة الاضلاع را گویند که سه ضلع داشته باشد\nذو اربعة الاضلاع آن شکل مستقیمة الاضلاع را گویند که چهار ضلع\nداشته باشد هر شکل مستقیعة الاضلاع که از چهار اضلاع داشته باشد\nآنرا کثیر الاضلاع میگویند و اگر پنج ضلع داشته باشد آنرا مخمس میگویند\nدائره منحنی","chars":736,"image":"https://storage.googleapis.com/adl-page-images/adl0131/00021.jpg","first_page":1,"last_page":381,"title":"Kitāb-i ʻIlm i masāḥat کتاب عالم ا مساحت","permalink":"https://afghanpress.org/book/adl0131/21","canvas":"https://afghanpress.org/iiif/adl0131/canvas/21","source":"https://afghanistandl.nyu.edu/books/adl0131/","source_pdf":"https://afghanistandl.nyu.edu/pdf/adl0131_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."}}