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lebar = l
panjang = 3l
120 = 2(p + l)
120 = 2(3l + l)
120 = 6l + 2l
120 = 8l
120/8 = l
15 cm = l
lebar = 15 cm
panjang = 15 x 3 = 45 cm
luas = 45 x 15 = 675 cm ^2
120 = 2(3l + l)
60 = 4l
l = 15 m
p = 3l = 45 m
Luas = p x l
= 45 m x 15 m
= 675 m²