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= 92-38 = 54.
54 : 2 = 27 cm -> lebar persegi panjang
27 x 19 = 513 cm -> luas
92 = 2. 19 +2l
92= 38 +2l
92-38=2l
54=2l
l =27
luas = p x l
= 19× 27
= 513