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sisa atas= 3cm
sisa bawah= x
40 per 40-4-4 = 60 per 60-3-x
40 per 32 = 60 per 57-x
40(57-×)= 60×32
2280-40x= 1920
40x= 2280-1920
40x=360
x = 9
sisa bagian bawah = 9 cm