Question

An open
cube
of length 40cm is made
from
metal sheet. How much sheet metal will
be required to to make this? The inside
and outside
outside surface of the
cube is to be
painted at rate of 10 paise her sq
am
how
much
will it coast cast to print
the cube?
​

Answer 1

Answer:

Note: The cube is open. So, we will get the surface area of five sides and not six sides.

The area of metal sheet used to make the cube = the total surface area of the cube.

The total surface area of an open cube is given by:

Area = 5S²

Substituting this in the formula we have:

Area = 5 × 40² = 8000 cm²

If we are painting the inside and outside of the cube, it means we will paint double the area.

So, the area painted = 8000 × 2 = 16000 cm²

The rate of painting is 10 pais per square cm

The cost of painting is = 16000 × 10 = pais 160000

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