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panjang = 3l
lebar = l
keliling = 2(p + l)
64 cm = 2(3l + l)
32 cm = 4l
l = 8 cm
panjang = 3 x 8 = 24 cm
lebar = 8 cm
luas = p x l
= 24 x 8
= 192 cm²
64 = 2(3l+l)
64 = 2(4l)
64 = 8l
8 = l
L = p×l
= 3l × l
= 24×8
=192