Vertical angle : শীর্ষকোণ;
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Appropriate Prepositions
Agree with, on, to(একমত হওয়া): My father agreed with me on this point, but he did not agree to my proposal to set up a canteen.
Annoyed at(ব্যক্তি ছাড়া অন্যকিছুর প্রতি বিরক্ত): They were annoyed at his rough behavior.
By heart (মুখস্থ): Kamal learnt to poem by heart.
Famous for (বিখ্যাত): Smith is famous for his wisdom.
Feed with (কোনো কিছু খাওয়া): They feed the cow with grass.
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Idioms
At home (comfortable— আরাম) He feels at home in Dhaka now.
At the eleventh hour (at the last moment-শেষ মুহুর্তে adv.) The patient was in a dangerous condition and the doctor came at the eleventh hour.
Die in harness (কর্মরত অবস্থায় মারা যাওয়া): Dr. Sen died in harness.
Far and wide (সর্বত্র): His fame spread far and wide.
Turn down (refuse, প্রত্যাখান করা) —He turned down my proposal.