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অনুভূমিক সরলরেখার ওপর অঙ্কিত পরস্পর সংলগ্ন একগুচ্ছ আয়তক্ষেত্র যাদের অনুভূমিক বিস্তার শ্রেণি ব্যবধানকে এবং উল্লম্ব উচ্চতা পরিসংখ্যানকে নির্দেশ করে, তাকে আয়তলেখ বলে।
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অনুভূমিক সরলরেখার ওপর অঙ্কিত পরস্পর সংলগ্ন একগুচ্ছ আয়তক্ষেত্র যাদের অনুভূমিক বিস্তার শ্রেণি ব্যবধানকে এবং উল্লম্ব উচ্চতা পরিসংখ্যানকে নির্দেশ করে, তাকে আয়তলেখ বলে।