Quadrilaterals : চতুর্ভুজ ক্ষেত্র; চতুর্ভুজ সমতল ক্ষেত্র;
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Appropriate Prepositions
Assent to(সম্মতি দেওয়া): The President has assented to the bill.
Count upon(নির্ভর করা): He always counts upon your help for this work.
Decide upon (সিদ্ধান্ত করা): We have not yet decided whether we are going to picnic.
Good for, at (ভাল): This man is good for nothing. He is good at English.
Repentance for (অনুতাপ): He has repentance for the past.
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Idioms
Arm in arm (পরস্পর সম্পর্কিত বিষয়) All good people should live arm in arm with one another.
At ease (in peace or pleasure – শান্তিতে বা আরামে) A man who has enemies can not live at ease.
Hush money (ঘুষ): He offered a hush money to disclose the file.
Lose heart (হতাশ হওয়া) — Do not lose heart in danger.
Put up with (সহ্য করা - tolerate): I could not put up with his behavior.