A large cube is formed from the material obtained by melting three smaller cubes of 3, 4 and 5 cm side. what is the ratio of the total surface areas of the smaller cubes and the large cube?
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Volume of large cube
= ( 3^3 + 4^3 + 5^3)
= 27+64+125
= 216 cm^3
Let the edge of a large cube x
x^3 =216
that's why
x = 6
now for the surface are
= 6(3^2+4^2+5^2) / 6(6^2)
= 50/36
= 25/18
= ( 3^3 + 4^3 + 5^3)
= 27+64+125
= 216 cm^3
Let the edge of a large cube x
x^3 =216
that's why
x = 6
now for the surface are
= 6(3^2+4^2+5^2) / 6(6^2)
= 50/36
= 25/18
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