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3,5x8 = 28
L= p x l
= 28 x 21
= 588
6 x (x) = 8 x 21
6x = 168
x= 168/8
x=28
jadi tinggi foto stlah di perbesar adlah 28 cm
Luas persegi = panjang x lebar
28 x 21
jdi luas foto tersebut = 588 cm²