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p = 9/2 t. 3/2 l = 9/2 t ~ l = 3 t
3/2 l = 9/2 t ~ t = 3/2 l : 9/2 = 1/3 l
Panjang semua rusuk = 4p + 4l - 4t
408 = 4. 3/2 l + 4lt + 4. 1/3l
408 = 6l + 4l + 4/3l
10l + 4/3l = 408
30/3 + 4/3l = 408
34/3l = 408
l = 408 . 3/34 = 36
p = 3/2l - 3/2 . 36 = 54
l = l = 36 =36
t = 1/3l = 1/3 . 36 = 12
Jadi, volume = p.l.t
= 54.36.12
= 23.128 cm³.