Ortho center : লম্ববিন্দু;
Related Words
ortho center  orthocenter  orthocentre  See Words Also In
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Appropriate Prepositions
Argue against (বিপক্ষে বলা): She argued against the bill.
Busy with(ব্যস্ত থাকা): Rahim is now busy with her homework.
Devote to (উৎসর্গ করা/নিয়োজিত করা): Students should devote sufficient time to their studies.
Monument to (স্মৃতিসৌধ): The monument to your right is a popular tourist attraction.
Sad at (দুঃখিত): All his colleagues were very sad at his transfer from this place.
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Idioms
Bad names (গালমন্দ—n) He called the man bad names.
Lose heart (হতাশ হওয়া) — Do not lose heart in danger.
On the whole (মোটের ওপর): On the whole, his conduct is good.
To the point (সঠিক) - The boy answered the question to the point.
With the sweat of one’s brow (মাথার ঘাম পায়ে ফেলে) — He earns his livelihood with the sweat of his brow.