Right angles : সমকোণ;
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Appropriate Prepositions
Cause for (চিন্তিত হওয়ার কারণ): He has never given me any cause for concern.
Cope with(সামলানো বা পেরে উঠা): They cannot cope with the situation.
Destitute of (নিঃস্ব; বিবর্জিত): He is destitute of any friend here.
Devote to (উৎসর্গ করা/নিয়োজিত করা): Students should devote sufficient time to their studies.
Substitute for (বদলে দেওয়া): This action is substitute for that.
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Idioms
At the eleventh hour (at the last moment-শেষ মুহুর্তে adv.) The patient was in a dangerous condition and the doctor came at the eleventh hour.
Call to mind (স্মরণ করা): I cannot call to mind your cell number.
Dead language (যে ভাষা এখন আর কথ্য নয়): Sanskrit is a rich language, but it is now a dead language.
Pick one’s pocket (পকেট মারা)— He tried to pick my pocket.
Square meal (পেট ভরা আহার): He is too poor to have a square meal everyday.