Pentagonal : পঁচভুজ; পঁচকোণী; পঞ্চভূজযুক্ত পঞ্চকোণী;
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Appropriate Prepositions
Adapt to(খাপ খাওয়ানো): Everybody must adopt himself to new environment.
Aware of(অবগত): I am not aware of his dishonesty.
Complain to (কারো কাছে নালিশ করা): You should not complain to his parents.
Convinced of (আশ্বস্ত): You are convinced of his product.
Grasp at (আঁকড়িয়ে ধরা): He grasped me at my hand.
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Idioms
At home (proficient in — দক্ষ) The students of Bangladesh should be at home in Bangla.
At a low ebb (in an unfavorable situation প্রতিকুল অবস্থায়, ভাটির মুখে) The popularity of this singer is now at a low ebb.
On the contrary (বিপরীত পক্ষে): I do not hate him; on the contrary I love him.
Put the cart before the horse (to reverse the natural order of things-কোনো জিনিসের স্বাভাবিক ক্রমকে পাল্টে দেয়া) - The leader put the cart before the horse.
To the letter (in all details, অক্ষরে অক্ষরে) —Follow my advice to the letter.