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32 = 4s
s = 8 cm
trus kita cari tinggi sisi tegaknya
luas sisi tegak = 1/2.a.t
20 = 1/2.8.t
20 = 4t
tinggi sisi tegaknya = 5 cm
kita cari tinggi prisma pake pitagoras
5,4, pasti sama 3
jdi
volume = 1/3. luas alas.tinggi
v = 1/3.8.8.3
volumenya = 96 cm³