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keliling =72 x 5 = 360 :4 =90
panjang sisi = 90, jadi luas pesegi adalah = s² = 90²=8100
72 = s x 4
s = 72 : 4
s = 18
L = sxs = 18 x 18 = 324
Karena disusun 5 persegi, maka 324 x 5 = 1620 cm persegi