Why? I still cant code the area of circle

Question

the number 12 project on c# is hard. I already tried alots of way. I really cant.

Here's my last coding for it

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;

//your code goes here

radius =
Console.ToDouble(Console.Readline());
double n = pi * (radius * radius);
Console.Writeline(n);
}
}
}

Answer 1

Notice carefully the last 3 lines of the snippet:

1. Convert.ToDouble not Console.ToDouble

2. Console.ReadLine not Console.Readline (uppercase L)
radius =
Convert.ToDouble(Console.ReadLine());

3. Console.WriteLine not Console.Writeline(uppercase L)

Console.WriteLine(n);