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Keliling alas = 2 (p+L) = 2 (18+14) = 2.32 = 64 cm
Luas selubung = K.t = 64.15 = 960 cm²
Luas permukaan = luas alat + luas tutup + selubung
= 252 + 252 + 960
= 1464 cm²