Straight angle : সরলকোণ;
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straight angle  straight angled  See Words Also In
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Appropriate Prepositions
Attend on/upon (সেবা করা): We should attend on/upon the ailing patient.
Aware of(অবগত): I am not aware of his dishonesty.
Consist in (কোনো কিছু মধ্য বিদ্যমান থাকা): Happiness consists in contentment.
Meet with (হঠাৎ কোন কিছু হওয়া): Yesterday I met with an accident.
Succeed in (সাফল্য লাভ করা): He succeeded in life.
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Idioms
Bad blood - (শত্রুতা): There has always been bad blood between these families.
Call to mind (স্মরণ করা): I cannot call to mind your cell number.
In full swing (পুরোদমে): The school is in full swing after the vacation.
Riding for a fall (বেপরোয়াভাবে কাজ করা- to act recklessly): He rides for a fall in the election.
Under age (অপ্রাপ্ত বয়স্ক)- He could not cast his vote because he was under age.