Question

Two identical cubes each of volume 64 cm3 are joined together end to end. What is the surface area of the resulting cuboid?

NCERT Class X
Mathematics - Exemplar Problems

Chapter _SURFACE AREAS AND VOLUMES

Answer 1

Volume = 64 cm3
So, edge of cube = 4 cm

So, length of resulting cuboid = (4+4) cm = 8cm

So, surface area of resulting cuboid = 2(8*4 + 4*4 + 4*8) cm2
= 2(32 + 16 +32) cm2
= 2*80 cm2
= 160 cm2

Answer 2

Answer:

Step-by-step explanation:

As the volume of one cube is 64 cm3

Then one side be 4 cm

Also given there are 2 cubes so we get that the total length will be :

4+4=8cm.

So the total surface area of the resulting cuboid will be : 2x(lb +bh + lh)

= 2(8x4 +4x4 +8x4)

=2(32+16+32)

=2(80)

=160cm2