Dihedral angle : দ্বিতলকোণ;
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Appropriate Prepositions
Absent from(অনুপস্থিত থাকা): I was absent from the class yesterday.
Admit into(প্রবেশ করতে দেওয়া): Only the selected people were admitted into the theater.
Agree to(ব্যক্তি ছাড়া অন্যকিছুর সাথে একমত হওয়া): We cannot agree to your proposal.
Cruise to (জয় লাভ করা): The Bangladesh team cruised to their fifth successive win this afternoon.
Send for (ডেকে পাঠানো): Send for a doctor immediately.
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Idioms
Hue and cry (শোরগোল): The villagers raised a hue and cry to see the thief.
In one’s teens (তের থেকে উনিশ বছর বয়সের মাঝে): She is yet in her teens.
To the point (সঠিক) - The boy answered the question to the point.
Take one to task (rebuke, তিরস্কার করা)— He took me to task for negligence of duty.
Widow’s mite (দরিদ্রের ক্ষুদ্র দান): A windows mite is no less important than a large contribution of a rich man.