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dik : L =841cm persegi
dit : k = ...?
peny: karena s belum diketahui,jadi :
L = s×s = s(kuadrat)
841 =s(kuadrat)
s=akar dari 841 = 29cm
jadi s= 29 cm
K= 4×s =4×29=116 cm
jadi k = 116 cm