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= 1/2*a*t
= 1/2*9*12=54 cm²
b. Luas permukaan
= (2*L alas)+(K alas*t prisma)
= (2*(1/2*9*12))+((9+12+15)*20)
= 108+720
= 820 cm²
c. Volume prisma
= L alas*tinggi
= (1/2*9*12)*20
= 54*20
= 1080 cm³