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

A 47
B 51
C 57
D 60

Correct Answer: 51

বর্গাকার দর্পণটির ডায়াগোনাল বা কর্ণ d = 20 ইঞ্চি " " " বাহুর দৈর্ঘ্য a = 202 = 102 ইঞ্চি আবার, বর্গের পেরিমিটার বা পরিসীমা = 4a = 4×102 = 56.67 ইঞ্চি = 56.57 ইঞ্চি সুতরাং সর্বচ্চ পরিসীমা হবে, 57 ইঞ্চি = 57 ইঞ্চি
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