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tinggi kubus 6 cm
tinggi limas 4 cm
tinggi segitiga selimut limas = V(4^2 + 3^2) = 5 cm
luas permukaan kubus tanpa tutup = 5 x 6 x 6 = 180 cm^2
luas selimut limas = 1/2 x 4 x 6 x 5
= 60 cm^2
luas bangun = 180 cm^2 + 60 cm^2 = 240 cm^2
jawaban B