অঙ্ক শেখো বাংলায়
ABCD একটি আয়তক্ষেত্র এবং O আয়তকেন্ত্রটির অভ্যন্তরে যে কোনো একটি বিন্দু। প্রমান করো যে, \(OA^2+OC^2=OB^2 +OD^2\)
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