A sphere is a regular three-dimensional object in which every cross-section is a circle.
Formula to calculate surface area of a sphere.
![How to Calculate Surface Area of a Sphere.](https://www.learntocalculate.com/wp-content/uploads/2020/04/How-to-Calculate-Surface-Area-of-a-Sphere.-5.png)
Where:
r – is the radius of the circle.
π – is a constant estimated to be 3.142.
Example:
A globe has a radius of 20 cm .Calculate the surface area of the globe.
In this case a globe is a good example of a sphere.So we are going to use the formula used to find the surface area of the sphere to calculate the surface area of the globe.
![How to Calculate Surface Area of a Sphere.](https://www.learntocalculate.com/wp-content/uploads/2020/04/How-to-Calculate-Surface-Area-of-a-Sphere.-6.png)
Therefore, the surface area of the globe is 5027.2 cm² .