C#:请定义一个等腰梯形结构,包括上底、下底、高、腰长,以及计算梯形周长和面积的方法.

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
namespace ConsoleApplication1
{
class Program
{
static void Main(string[] args)
{
//上底
Double a = 0;
//下底
Double b = 0;
//腰长
Double c = 0;
Double height = 0;
Double girth = 0;
double area = 0;
try
{
Console.WriteLine("输入上底:");
a = Convert.ToDouble(Console.ReadLine());
Console.WriteLine("输入下底:");
b = Convert.ToDouble(Console.ReadLine());
Console.WriteLine("输入腰长:");
c = Convert.ToDouble(Console.ReadLine());
}
catch (Exception e)
{
Console.Write("输入的数据格式不合法,请重填");
}
height = Math.Sqrt(4*c*c-Math.Pow(b-a,2)) / 2;
girth = a + c + c + b;
area = (a + b) * height / 2;
Console.WriteLine("梯形的周长为:{0}",girth);
Console.WriteLine("梯形的面积为:{0}",area);
Console.ReadKey();
}
}
}