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t = 12
Rumus umum Luas permukaan pada prisma:
LaTeX susah dicopas, kebanyakan cara menulisnya mengetik sendiri.
tinggi segitiga =√12²+5² = √144+25 =√169 = 13cm
luas 1 segitiga = 1/2 alas x tinggi = 1/2 x 10 x 13 = 65cm²
luas limas = 4x65 + 100 = 360cm²