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panjang= 2t=2x50= 100
lebar = p-40 = 100-40 =60
jwb :
L1,2= 2(100x60) = 12000
L 3,4 = 2(100x50) = 10000
L 5,6 = 2(50x60) = 6000
total= 12000 + 10000 + 6000 =28000 cm²