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L = 6 x s²
Maka,
150 = 6 x s²
s² = 150 : 6
s² = 25
s = √25
s = 5 cm
Sehingga,
d² = s² + s²
d² = 5² + 5²
d² = 25 + 25
d² = 50
d = √50
d = 5√2 cm
(JAWABAN D)