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651= 42 × d2 × 1/2
651×2=42 × d2 ×1
1302= 42d2
1302÷42= d2
31=d2
d2= 31 cm
1/2.d1.d2=651
d1.d2=651.2
42.d2=1302
d2=1302/42
d2=31