কোন দেশের সঙ্গে বাংলাদেশের সমুদ্র-সীমানা রয়েছে ?
A helicopter company charges $85 for the first kilometer of a trip and $5 every kilometer after that. If the total cost of a trip was $365, how many kilometers were flown?
How many triangles are there in the following diagram?
9
১২
১৩
১৫