Question

A cube has a side 1.2 cm. Its surface area is
Cous cm2 10218 8.6 cm
(3) 8.64 cm2 (4) 8.0 cm2​

Answer 1

Its surface area is → option (3): 8.64 cm².

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Let's understand a few concepts:

To solve the given problem we will use the following formula:

$\boxed{\bold{Total \:Surface \:Area\:of\:a\:cube = 6 \times side^2 = 6a^2 }}$

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Let's solve the given problem:

The length of each side of the cube (a) = 1.2 cm

Therefore, by using the above formula, we get

The total surface area of the given cube is,

= $6 \times a^2$

• on substituting a = 1.2 cm

= $6 \times (1.2)^2$

= $6\times 1.44$

= $\bold{8.64\:cm^2}$ ← option (3)

Thus, the surface area of the cube is 8.64 cm².

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Answer 2

Answer:

Its surface area is → option (3): 8.64 cm².

Step-by-step explanation:

Its surface area is → option (3): 8.64 cm².

Let's understand a few concepts:

To solve the given problem we will use the following formula:

Let's solve the given problem:

The length of each side of the cube (a) = 1.2 cm

Cube has six surfaces each surface is a square of area $=a^{2}$

Where $a$ is the side length of square

Hence surface area of the cube $=6 \mathrm{a}^{2}$

$\begin{aligned}&=6(1.2)^{2} \\&=6 \times 1.44 \\&=8.64 \\&=8.6 \mathrm{~cm}^{2} \text { (Rounding off) }\end{aligned}$