我初学
public void RectTriangle(int a,int b):base(va,vb,(int)Math.Sqrt（va*va+vb*vb)))
这句总是提示我格式错误，标点什么的，是下面代码的最后面


using System;

namespace MyShape
{
    
    public class Shape
    {
        public virtual void Draw()
        {;}
        public virtual int GetArea(){
        return 0;
        }
    }
}



using System;
namespace MyShape
{
    public class Triangle:Shape
    {
        protected int a;
        protected int b;
        protected int c;
        public Triangle(int va,int vb,int vc)
        {
            a=va;
            b=vb;
            c=vc;
        }
        public override int GetArea()
        {
            int s=(a+b+c)*2;
            int area=(int)(Math.Sqrt(s*(s-a)*(s-b)*(s-c)));
            return area;
        }
        public class TectTriangle:Triangle
        {
            new protected int a;
            new protected int b;
            public void RectTriangle(int a,int b):base(va,vb,(int)(Math.Sqrt(va*va+vb*vb)))
        
        {
            a=va;
            b=vb;
        }

    }
    
}