Question

If 3 cubes of side 'a' are joined end to end, the surface area of the new cuboid formed is:

Answer 1

Answer:

The dimensions of the cuboid so formed are as under:

l= length=15cm,b= breadth=5cm, h= height =5cm

Surface area of the cuboid =2(15×5+5×5+15×5)cm

2

=2(75+25+75)cm

2

=350cm

2

Answer 2

Step-by-step explanation:

after joining ,

length =a+a+a =3a

breadth = a

height = a

surface area of cuboid = 2(lb + bh + hl)

= 2(3a*a + a*a + a*3a)

=2(3a²+a²+3a²)

= 2(7a²)

=14a²

if a=5

TSA = 14*5*5

= 350cm²