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567 = s×s×21
= s×s
27 = s×s
s = 3
kalo sisinya udh ketemu tinggal cari bidang diagonalnya
567=1/3.la.21
567=7la
la= 81
sisi = 9
diagonal bidang nya = 1/2 n (n-3).
diagonal bidangnya = 1/2.9(9-3)
diagonal bidangnya = 1/2.9.6
diagonal bidangnya = 27