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Karena bangun datar ABCD = EFGH maka sama dengan
Luas permukaan prisma = ABCD × 2 + CGFB + DHEA + AEFB + DHGC
ABCD × 2 =>
× BA × 2
= × 8 × 2
= 18 × 8
= 144 cm2
CGFB =>
= 6 × 20 =120 cm2
DHEA =>
= 20 × 12 = 240 cm2
AEFB=>
= 8 × 20 = 160 cm 2
DHGC=>
= 20 ×10 = 200 cm2
Luas permukaan = 144 + 120 +240 + 160 + 200= 864 cm2