Dihedral angle : দ্বিতলকোণ;
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Appropriate Prepositions
Complain about (কোনো বিষয়ে নালিশ করা): They complained about the mismanagement of the programme.
Dull at (অপ্টু/কাঁচা): He is dull at mathematics.
Feed on (খেয়ে বাঁচা): The cow feeds on grass.
Loyal to (অনুগত): Every citizen must be loyal to the state.
Short of (অপর্যাপ্ত): I am running short of money.
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Idioms
Fair play (প্রতারণা বিহীন নীতি বা কাজ): I believe in the practice of fair play in my business.
In one’s teens (তের থেকে উনিশ বছর বয়সের মাঝে): She is yet in her teens.
Null and void (বাতিল): The deed has been null and void now.
Of course (অবশ্যই): Of course, you know what that meant.
Under age (অপ্রাপ্ত বয়স্ক)- He could not cast his vote because he was under age.