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Lp prisma=(2*la)+(k*t)
La =(15+20)*12/2) =210 cm persegi

AB-DC=20-15=5
DA=√5 KUADRAT +12 KUADRAT =√25+144=√169=13

K=AB+BC+CD+DA=20+12+15+13=60 cm
Tinggi =40cm

Lp prisma =(2*210)+(60*40)=420+2400=2.820 cm persegi