Class Retângulo:

gistfile1.cs

/*
 * Created by SharpDevelop.
 * User: ruan
 * Date: 10/05/2014
 * Time: 11:15
 * 
 * To change this template use Tools | Options | Coding | Edit Standard Headers.
 */
using System;

namespace caixa
{
	
	class Retangulo
	{
		public double _base;
		public double _altura;
		
		public Retangulo(double _base, double _altura)
		{
			this._base = _base;
			this._altura = _altura;
		}
			
		public double area()
	    {
		    double calculo = this._base * this._altura;
		    return calculo;
		}
		
		public double perimetro()
		{
			double calculo = (this._base * 2) + (this._altura * 2);
			return calculo;
		}
				
				
	}
	
	class Program
	{
		
		
		public static void Main(string[] args)
		{
			
			var retangulo = new Retangulo(15,10);
			Console.WriteLine("Area do Retangulo é " + retangulo.area());
			Console.WriteLine("Perimetro do Retangulo é " + retangulo.perimetro());
			
			
			
			
			Console.Write("Press any key to continue . . . ");
			Console.ReadKey(true);
		}
	}
}