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- using System;
- namespace _02.Area_and_Perimeter_Circle
- {
- class Program
- {
- static void Main(string[] args)
- {
- //1. прочитаме радиус -> double
- //2. пресмятаме лицето = пи * радиус * радиус
- //3. пресмятаме периметъра = 2 * пи * радиус
- //4. отпечатваме лицето и периметъра
- double radius = double.Parse(Console.ReadLine());
- double area = Math.PI * Math.Pow(radius, 2);
- double perimeter = 2 * Math.PI * radius;
- //начин 1: Console.WriteLine($"Area = {area:F2}");
- //начин 2:
- Console.WriteLine("Area = " + Math.Round(area, 2));
- //начин 1: Console.WriteLine($"Perimeter = {perimeter:F2}");
- //начин 2:
- Console.WriteLine("Perimeter = " + Math.Round(perimeter, 2));
- }
- }
- }
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