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maaf kalau salah hehee
Cara cari rusuk dengan pitagoras
S^2+s^2=/128^2
2s^2=128
S^2=128:2
S^2=64
S=8
Jadi, panjang rusuknya adalah 8cm
Luas permukaan:
6(sxs)
=6(8x8)
=6(64)
=384 cm^2
Semoga membantu