Question

Four cubes each of side 5cm are joined end to end .the surface area of the resulting solid is

Answer 1

450 centimeters squared
as we join the squares the surface area of some squares vanishes

Answer 2

There are four cubes.

Each side of each cube is 5cm in length

When they are joined end to end, a cuboid is formed. having

Lenghth=5x4 cm=20 cm

Breadth= 5 cm

Height=5 cm

According to the formula for surface are of a cuboid,

Surface Area= 2( lxb+lxh+bxh)

                     = 2( 20x5 + 20x5 + 5x5) sq. cm

                     = 2(100+100+25) sq. cm

                      =450 sq. cm

Hence, the surface area of the resulting solid is 450 sq.cm