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864 = 6.s²
144 = s²
s = 12
rusuk kubus : panjang balok
3 : 4
12 : 16
p : l : t
4 : 3 : 2
16 : 12 : 8
Lp balok = 2x(p x l)+(pxt)+(lxt)
= 2x(16 x 12 ) + ( 16 x 8 ) + ( 12 x 8 )
= 2x (192 + 128 + 96)
= 2x 416
= 832
I think how complicated pokojawabannya a