Jawabanmu

2014-06-03T17:10:22+07:00
Diagonal bidang = √72
                       = 6√2 cm
a. diagonal bidang = s√2
6√2 = s√2
s = 6√2/√2
s = 6cm
panjang rusuknya 6 cm
b.Lpermukaan = 6s²
=6.6²
=6.36
=216 cm²