Question

10 cubes each of edge 1 cm long are placed together. Find the total surface area of the cuboid so formed


Spams will be reported on the spot ​

Answer 1

640 cm2

Two cubs with edge length 8 cm are joined 

new length = 2 (8 cm) = 16 cm

new breadth = 8 cm

new height = 8 cm

Surface area of cuboid 2 (lb+bh+hl)

=2[16×8+8.8+8×16]

2[320]=640cm2

MARK ME AS A BRAINLIST

Answer 2

Given:

• 10 cubes of side 1 cm are placed together.

To Find:

• T.S.A or Surface area of the newly formed cuboid.

Solution:

By joining two cubes of each side of 1 cm end to end, we get a cuboid whose,

• $\\\sf \: Length = 10 \times 1 \: cm = 10 \: cm$
• $\sf \: Breadth \: = 1 \: cm$
• $\sf \: Height = \: 6 cm$

Now , as we know that :

formula used:

$\\★\underline {\boxed {\bf{ \red{{T.S.A}_{(Cuboid)} = 2(lb + lh + bh) }}}}$

Substituting values:

⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀⠀

$\\\sf { \dashrightarrow{T.S.A}_{(Cuboid)} = 2 (10 \times 1) + ( 1\times 1) + (10 \times 1) \: {cm}^{2} }$

$\sf {\dashrightarrow{T.S.A}_{(Cuboid)} = 2(10 + 1 + 10) \: {cm}^{2} }$

$\sf {\dashrightarrow {T.S.A}_{(Cuboid)} = 2(21) \: {cm}^{2} }$

${ \bf { \pink{\dashrightarrow {T.S.A}_{(Cuboid)} =42 \: {cm}^{2} }}}$

Hence, total surface area is

$\underline{\bf {\: {42 \: {cm}^{2} }}}$

⠀⠀⠀⠀⠀⠀⠀⠀