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20 x 3 = 60
p+l+p+l =12+60+12+60= 144 cm
ukuran stelah diperbesar = 3(4 . 20) = 12 cm . 60 cm
keliling foto baru = 2(12 + 60) = 2 . 72 = 144 cm
jadikan jawaban terbaik ya :-)