Three cubes with sides 1.5 cm, 2 cm and 2.5 cm are melted to form a bigger cube. The surface area of the bigger cube is: (in cm 2)
Let side of bigger cube be a cm. So, a 3 = (1.5)3 + 23 + (2.5)3 a3 = 3.375 + 8 + 15.625 a3 = 27 a =3 surface area of the bigger cube = 6 x 32 = 6 x 9 = 54 cm 2
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