If a square mirror has a 20-inch diagonal, what is the approximate perimeter of the mirror, in inches?

If a square mirror has a 20-inch diagonal, what is the approximate perimeter of the mirror, in inches? Correct Answer None of these

বর্গাকৃতির আয়নাটির কর্ণ (diagonal) 20 inch আমরা জানি, বর্গের কর্ণ = 2×বাহুর দৈঘ্য∴2×বাহুর  দৈঘ্য = 20  বা, 2a = 20 বা, a = 22 = 2022×2 = 102 = 14·14∴বগে পরিসীমা =  4× বাহুর দৈঘ্য = 4×14·14 = 56·56 inch (প্রায়)
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