Quadrangle : চতুর্ভুজ সমতল ক্ষেত্র;
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quadrangle  quadrangles  quadrangular  See Words Also In
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Appropriate Prepositions
Angry with(কারো সাথে ক্রুদ্ধ হওয়া): The teacher was very angry with the students.
Burst into(কান্নায় ভেঙ্গে পড়া): He burst into tears.
Derive from (উৎসারিত হওয়া): The one has been derived from the poem.
Detrimental to (অপকারী): Smoking is detrimental to health.
Regret for (দুঃখ করা): We regretted for his failure.
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Idioms
At home (proficient in — দক্ষ) The students of Bangladesh should be at home in Bangla.
Crying need (জরুরী): Mass education is a crying need for India.
Slip of the pen (লেখায় অসতর্কতাবশত সামান্য ভুল): The mistake is due to a slip of the pen.
Short temper (রগচটা)— He is a man of short temper.
Well off (স্বচ্ছল) - Jim and Della were not well off.