Question

Calculate the surface area of a sphere with a diameter of 28

Answer 1

Answer: the surface area of the sphere of diameter 28cm is 2464 cm²

Step-by-step explanation:

Given, diameter = 28 cm

hence, radius of the sphere = d/2 = 28/2 =14 cm

Therefore, the surface area of a sphere of radius (r) = 4пr²

where п= 22/7= 3.14

= 4×3.14×14×14

= 2464 cm²

Answer 2

The surface area of a sphere is 2461.76 units.

Explanation:

Given;

• Diameter (d) of a sphere = 28 units

To Find;

• Area of Sphere

Formula;

• A = 4 π r²

where,

π = 3.14 or 22/7

r = radius of sphere

Here, we know that

radius = diameter ÷ 2 = 28/2 = 14 units

So,

A = 4 π r²

A = 4 × 3.14 × (14)² units

A = 12.56 × 196 units

A = 2461.76 units

Thus, The surface area of a sphere is 2461.76 units.