d=√j²-(R1+r2)²
24=√j²-(12+6)²
24²=j²-(18)²
576=j²-324
576+324=j²
j=√900
j=30 cm
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d=√j²-(R1+r2)²
24=√j²-(12+6)²
24²=j²-(18)²
576=j²-324
576+324=j²
j=√900
j=30 cm