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6 s² = 1350 <==> s²= 225
s=√225=15
diagonal sisi d²= s² + s² = 225+225=450
d =√450
diagonal ruang merupakan sisi miring dari segitiga sisi s dan diaogonal sisi d
r² = d² + s² = 450+225=675 <---> r = √675 =√(25 . 9 .3) = 5.3√3=15√3