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1/2 IF = 16√2
IF = 16√2 x2 = 32√2
EI² + EF² = IF², karena berupa kubus maka EI= EF = s
s² + s² = (32√2)²
2s² = 32² (√2)²
s² = 32² x 2 / 2
s² = 32²
maka s = 32 cm