Triangle : ত্রিভূজ, ত্রিকোণ;
Related Words
tranquil  tranquilize  transalpine  translate  translates  translocate  translucent  triangle  triangles  triangular  turnsole  See Words Also In
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Appropriate Prepositions
Apathy towards (অনাগ্রহ): The student has great apathy towards his studies.
Hard of (কানে খাটো বা কম শোনা): Ratan is a hard of hearing.
Lost in (মগ্ন): Simon is lost in meditation.
Relation with (সম্পর্ক): I have no relation with the culprit.
Work with (কারো সাথে কাজ করা): They will be working with me on the new project.
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Idioms
At all (in the least degree – মোটেও না) There is no water at all in the pond.
Back and bally (জীবিকা, ভরণ পোষণ—n) Who will provide the increasing population with the required back and bally?
Eat humble pie (অপমান হজম করে ক্ষমা চাওয়া): The manager had to eat humble pie before his employees.
Put up with (সহ্য করা - tolerate): I could not put up with his behavior.
Read between the lines (understand the significance, অন্তনিহিত অর্থ বুঝা) Try to read between the lines of the letter.