Question

find the surface area of a sphere of radius 4,2cm​

Answer 1

Answer:

Radiu

Step-by-step explanation:

Given - Radius of sphere(r) = 4.2 cm

to find - surface area of sphere=?

surface area of sphere= 4 π r²

= 4 × 3.14× 4 .2 ×4.2

= 4×3.14×2.52

=12.56×2.52

=31.6521cm²

Answer 2

Answer:

Hence, surface area of Sphere will be 221.76 Sq. cm

Step-by-step explanation:

In context to question asked,

We have to determine the surface area of the sphere.

As per question,

We have,

Radius of sphere = 4.2 cm

As we know that,

Sphere is a three dimensional figure.

The surface area of sphere can be determined by using formula,

$Area = 4 \Pi r^2$

So, for determining the surface area we will put the value of r given in the question in above formula,

Thus we will get,

$Area = 4 \Pi r^2\\=> 4 \times \frac{22}{7} \times 4.2 \times 4.2\\=>4 \times 22 \times 4.2 \times 0.6\\=>221.76\:cm^2$