If the length of a rectangle is 8 cm and its diagonal is 10 cm, find its area. (একটি আয়তক্ষেত্রের দৈর্ঘ্য ৮ সেমি এবং এর কর্ণ ১০ সেমি হলে, এর ক্ষেত্রফল নির্ণয় করুন।)

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