关于c＃：创建一个计算面积的程序

Creating a program that calculates area

我有四个我正在努力解决的错误。

在用于打印形状区域的写入行块中，变量"area"出现的两个位置都给出错误消息："名称"area"在当前上下文中不存在"。第二个问题在类矩形中："ComputeArea"的几何图形中，错误为"Rectangle.ComputeArea()"隐藏继承的成员"GeometricFigure.ComputeArea()"。如果有意隐藏，请使用new关键字。"最后一个错误在类triangle:geometricFigure中，并涉及"public triangle(int x，int y)"表达式中的"triangle"。错误消息为"rectangle.computerea()"隐藏继承的成员"geometricFigure.computerea()"。如果要隐藏，请使用新关键字。

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using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using static System.Console;
namespace ShapesDemo
{
class Program
{
static void Main(string[] args)
{
Rectangle rec = new Rectangle(8, 10);
Square squ = new Square(11, 12);
Triangle tri = new Triangle(10, 20);
Console.WriteLine("Computed area is {0}" +"

" +"Computed Triangle is: {1}" +"
",
squ.ComputeArea(area), tri.ComputeArea(area));
}
}
abstract class GeometricFigure
{
public GeometricFigure(decimal sideA, decimal sideB)
{
this.height = sideA;
this.width = sideB;
}
protected decimal area;
protected decimal width;
protected decimal height;
public decimal Height
{
get
{
return height;
}
set
{
height = value;
ComputeArea();
}
}
public decimal Width
{
get
{
return width;
}
set { width = value; }
}
public decimal Area
{
get { return area; }
set { area = value; }
}
public void ComputeArea()
{
}
}
class Rectangle : GeometricFigure
{
public Rectangle(decimal sideA, decimal sideB) : base(sideA, sideB)
{

}
public void ComputeArea()
{
area = width * height;
WriteLine("The Area is" + width.ToString(), height.ToString());
}
static void Display(Rectangle rec)
{

}
}
class Square : GeometricFigure
{
static void Display(Square squ)
{
}
public Square(decimal sideA, decimal sideB) : base(sideA, sideA)
{
}
}
class Triangle : GeometricFigure
{
static void Display(Triangle tri)
{
}
public Triangle(int x, int y)
{
this.Width = x;
this.Height = y;
}
}

}