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a. Luas permukaan prisma
LP = 2 × La + L BFCD + L ACFD + L ABED
Lp = 2 × (1/2 × AC × AB) + (BC × CF) + (AC × CF) + (AB × BE)
Lp = 2 × (1/2 × 12 × 9) + (15 × 23) + (12 × 23) + (9 × 23)
Lp = 2 × (54) + 345 + 276 + 207
Lp = 108 + 345 + 276 + 207
Lp = 936 cm^2
maka Luas permukaan prisma tersebut adalah 936 cm^2
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b. Volume prisma
V = 1/2 × AB × AC × CF
V = 1/2 × 9 × 12 × 23
V = 1.242 cm^3
maka volume prisma tersebut adalah 1.242 cm^3
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semoga membantu, maaf jika salah