Question

Three cubes each of side 15 cm are joined end to end. Find the total surface area of the resulting cuboid.

Answer 1

See above pic.
Hope it helpful to u.

Answer 2

Given,

New length (l) = 15+15+15 = 45cm,

New breadth (b) = 15cm,

New height (h) = 15cm,

To find,

The total surface of the resulting cuboid.

Solution,

The formula of the total surface of the cuboid: $2(lb + bh+ hl)$.

⇒ 2( 45 x 15 + 15 x 15 + 15 x 45)

⇒ 2 × 1575

⇒ 3,150 $cm^{2}$

Therefore, the total surface area of the cuboid is 3,150 $cm^{2}$ .