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p=2×t=100cm
l=p-4cm=96cm
luas I:
2×p×l=2×100×96
=19200cm²
luas II:
2×p×t=2×100×50
=10000cm²
luas III:
2×l×t=2×96×50
=9600cm²
luas permukaan=19200+10000+9600
=38800cm²
saya mohon maaf apabila terjadi salah hitung