Dihedral angle : দ্বিতলকোণ;
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Appropriate Prepositions
Apology to (কারো কাছে ক্ষমা চাওয়া): Rakib should ask apology to her.
Convenient to(সুবিধাজনক): The work is convenient to your nature.
Dull at (অপ্টু/কাঁচা): He is dull at mathematics.
Full of (পরিপূর্ণ): Our Rivers are full of fishes.
Substitute for (বদলে দেওয়া): This action is substitute for that.
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Idioms
At dead of night (গভীর রাতে) The police caught the thief at dead of night.
Dead against (তীব্র বিরোধী - strongly opposed to): I am dead against corruption.
Look into something (তদন্ত করা- investigate) - The manager looked into the matter.
Pave the way (সুপ্রসন্ন করা) – I am sure I can pave the way for your success.
To the contrary (against what some one had said, পক্ষান্তরে) —He said nothing to the contrary.