Straight angle : সরলকোণ;
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straight angle  straight angled  See Words Also In
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Appropriate Prepositions
Alarm at, by, for(আশংকা করা/শঙ্কিত হওয়া): I was not alarmed at/by the news, but I was alarmed for their safety.
Annoyed at(ব্যক্তি ছাড়া অন্যকিছুর প্রতি বিরক্ত): They were annoyed at his rough behavior.
Cast aside (ছুঁড়ে ফেলা): As soon as they become rich they cast aside their poor friends.
Destitute of (নিঃস্ব; বিবর্জিত): He is destitute of any friend here.
Sad at (দুঃখিত): All his colleagues were very sad at his transfer from this place.
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Idioms
Brown study (দিবাস্বপ্ন): The girl is absorbed in a brown study.
Milk and honey – (প্রাচুর্য)- He lives with milk and honey.
To the utmost (যথাসাধ্য) - I tried to the utmost of my ability to have a job.
Through and through (পুঙ্খানুপুঙ্খু রুপে)- He read the poem through and through.
Up and doing (উদ্যোগী): Be up and doing and then you will succeed in your life.