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64 = 2 (4 + x + x)
32 = 4+2x
32 -4 = 2x
28 = 2x
x = 14
pjg = x + 4 = 14 + 4 = 18cm
lebar = 14 cm
luas = p x l = 14 x 18 = 252 cm²
64: 2×(4+l)
64:8+2l
64-8:2l
56:2l
56/2:l
28:l
luas= p×l
luas= 4×28
luas= 112 cm