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# Area of a circle

We are going to write a program that will calculate the area of â€‹â€‹a circle. The area enclosed by a circle of radius r is Ï€rÂ², where Ï€ (pi) is the constant ratio of the circumference of any circle to its diameter, and r is the radius. The given program declares a constant pi variable with a value of 3.14. Complete the program to take the radius as input, then calculate and output the area of the circle. Sample Input 5 Sample Output 78.5

4 Answers

+ 3

Hi Alexander, can you show us your attempts at solving the problem? It would give us better context to understand where you are stuck.

0

Hi hatsy,
My solution is below
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
namespace SoloLearn
{
class Program
{
static void Main(string[] args)
{
const double pi = 3.14;
double[] radius = {5,6.4,10};
double area;
int i =0;
double t = Convert.ToDouble(radius[i++]);
switch(t)
{
case 5:
area = pi
* (t * t);
Console.WriteLine(area);
break;
case 6.4:
area = pi
* (t * t);
Console.WriteLine(area);
break;
case 10:
area = pi
* (t * t);
Console.WriteLine(area);

- 1

Read the task description carefully:
"Complete the program to take the radius as input"