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a. panjang rusuk
diagonal sisi= s2+s2
diagonal ruang =s2+s2+s2
48=s2+s2+s2
s2=48:3 =16
s = 4
b. Lp= 6s2
= 6*4*4
= 96
= √48
= √16×√3 ⇒ 4√3 cm
a. panjang rusuk kubus = 4 cm
b. lp = 6.s²
= 6.16 ⇒96 cm²
2. lp = 468 cm²
perbandingannya adalah = p= 4/3l atau l= 3/4p
p= 2t atau t= 1/2p
l= 3/2t atau t = 2/3l
468 = 2( 4/3l.l+4/3l.2/3l+l.2/3l)
468 = 2(4/3l² + 8/9l² +2/3l²)
_________________________ ×9
4212 = 24l² + 16l² + 12l²
4212 = 52l²
l² = 81
l = 9 cm
p = 4/3l
= 12 cm
t = 2/3l
= 6 cm