The **area** of a sphere is the total area covered by the sphere's outer surface. In C#, we can calculate it using the sphere's radius.

4 * Math.PI * r * r

Syntax for calculating area of a Sphere in C#

`Math.PI`

: This is an built-in value that represents the mathematical value Pi**.**

`r`

: This represents the radius of the sphere.

using System;class HelloWorld{// create function to get the areasstatic void GetArea(double r){double area = 4 * Math.PI * r * r;Console.WriteLine("The area of the sphere with radius "+r+" is "+area);}// main methodstatic void Main(){// create radius of some spheresdouble r1 = 10;double r2 = 1.5;double r3 = 4.5;double r4 = 8;// get the area of the spheresGetArea(r1);GetArea(r2);GetArea(r3);GetArea(r4);}}

- Line 5: We create a method called
`GetArea()`

. It takes the sphere's radius, calculates the area, then prints the result to the console screen. - Lines 14–17: In the
`Main`

method, we create the radii of some spheres. - Lines 20–23: We call the
`GetArea()`

method, and display the results on the console.

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