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tinggi = 9 cm
lebar = 7 cm
lebar diperbesar = 28 cm
maka ;
7/28 = 9/x
7x = 28 x 9
x = 252 / 7
x = 36 cm
tinggi setelah diperbesar = 36 cm
jadi Luas = tinggi x lebar
= 36 x 28
= 1.008 cm²