The diagonal of a rectangle is √41 cm and its area is 20 cm². What is the perimeter of the rectangle? (একটি আয়তক্ষেত্রের কর্ণ √৪১ সেমি এবং এর ক্ষেত্রফল ২০ বর্গ সেমি। আয়তক্ষেত্রটির পরিসীমা কত?)

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