Subtended angle : সম্মুখ কোণ;
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Appropriate Prepositions
Averse to (বিমুখ): Rahim was averse of your various problems.
Bar to(বাধা): Poverty is not a bar to happiness.
Famous for (বিখ্যাত): Smith is famous for his wisdom.
Feed on (খেয়ে বাঁচা): The cow feeds on grass.
Worry about (কোনো কিছু বা কাউকে নিয়ে উদ্বিগ্ন হওয়া): Please, don’t worry about me. I will be alright.
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Idioms
At a standstill (নিশ্চল, অচলাবস্থায়-adj.) The discussion is now at a standstill.
Fair play (প্রতারণা বিহীন নীতি বা কাজ): I believe in the practice of fair play in my business.
Ins and out (খুঁটিনাটি): I know ins and outs of this file.
Slow coach (অলস): You cannot expect much from a slow coach.
Upper hand (প্রাধান্য) - He got the upper hand in the selection.