Math

Three cubes of volume 343 cubic cm are joined end to end.find surface area and volume of the resulting cuboid.

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  1. since 343=7^3 the cubes are 7 cm on a side
    By joining them, 4 faces are hidden. Each cube has 6 faces.
    So, the remaining surface area is 3*(6*7^2)-4*7^2 = 686 cm^2

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  2. Well, the volume is simply 3 times one of the cubes.
    For the surface area, think of what you would see.
    Wouldn't 4 faces not be visible ?

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