Question

find the surface area of a sphere with a radius of 8 cm.

Answer 1

We recall that the surface area of a sphere is $4\pi r^2$

Given: Radius of the Sphere is 8 cm

The surface area of the sphere = $4\pi \times 8^2$

= $4\times \frac{22}{7}\times 64$

= $\frac{5632}{7}$

=$804.60 \ cm^2$

Answer 2

Given,

The radius of the given sphere = 8 cm.

To Find,

The surface area of the sphere.

Solution,

The formula for a surface area of a sphere, with a radius $r$ = $4\pi r^{2}$

Now since the radius of the given sphere is 8cm,

Now by substituting the given values in the above formula, we get

The area of the given sphere = $4\pi (8^{2})$

Since the value of $\pi$ = $\frac{22}{7}$

Now by substituting the value of $\pi$ in the above formula, we get

The area of the given sphere = $4(\frac{22}{7}) = 256 (\frac{22}{7}) = 804.57 cm^{2}$

Henceforth, the area of the sphere is $804.57$$cm^{2}$