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misalkan; r1=3x dan r2=5x
Lpermukaan2-Lpermukaan1=720
5.(5x)²-5.(3x)²=720
5.25x²-5.9x²=720
125x²-45x²=720
80x²=720
x²=720÷80
x²=9
x=√9=3
r1=3x=3.3=9
r2=5x=5.3=15
Vterbesar=15.15.15=3375cm³