Question

Three cubes each of side 2.5 cm are joined end to end. The surface area of resulting solid is

Answer 1

Answer

The surface area of resulting solid is= 87.5 square cm

Explanation

It is given that three cubes of side = 2.5cm.

These three cubes are joined end to end

We get cuboid with length =3 x 2.5 = 7.5 cm

           Breadth = 2.5 cm and height =2.5cm

Here breadth and height are equal,

So this cuboid have 4 equal face with dimension 7.5 x 2.5

and other two face are equal with dimension 2.5 x 2.5

So the surface area of resulting solid = 4x ( 7.5 x 2.5) + 2(2.5 x2.5) =87.5 square cm

Answer 2

Length = 2.5 x 3 = 7.5 cm

Breadth = 2.5 cm

Height = 2.5 cm

Total surface area = 2(LB + BH + LH)

Total surface area = 2(7.5 x 2.5 + 2.5 x 2.5 + 7.5 x 2.5)

Total surface area = 2(18.75 + 6.25 + 18.75)

Total surface area = 2(43.75)

Total surface area = 87.5 cm³

Answer:  Surface Area =  87.5 cm³