Question

If each edge of a cube is reduced by 25%, find the
percentage decrease in its total surface area. explain​

Answer 1

Let each edge of cube be 10 units

Then, its surface area = 6a

2

=6×10

2

=600sq.units

New edge =10+25% of 10=12.5 units

∴ New, surface area =6×(12.5)

2

=937.5sq.units

% increase =

600

937.5−600

×100=56.25%