Get and Set method

Question

Following is a book exercise. I develop a program according to instruction in the exercise. I wish to whether my program is correct. Because there are in two places ComputeDiameter(); and ComputeArea(); is coming

Create a class named circle with fields named radius, area, and diameter. Include a constructor that sets the radius to 1. Also include public methods named SetRadius(); GetRadius(); GetDiam(); GetArea(); ComputeDiameter(), which computes a circle's diameter; and ComputeArea(), which computes a circle's area. (The diameter of a circle is
twice its radius; the area is 3.14 multiplied by the square of the radius.)

Create a class named TestCircle whose Main() method declares three circles objects. Using the SetRadius() method, assign a small radius value to one Circle and assign a larger radius value to another Circle. Do not assign a value to the radius of the third circle; instead, retain the value assigned at construction. Call ComputeDiameter() and ComputeArea() for each Circle and display the results.


using System;

namespace ConsoleApplication1
{
class TestCircle
{
static void Main(string[] args)
{
Circle x1 = new Circle();
Circle x2 = new Circle();
Circle x3 = new Circle();

x1.SetRadious(10);
x2.SetRadious(100);
x3.SetRadious(1);

Console.WriteLine("Radious({0}), Diameter({1}), Area({2})", x1.GetRadious(), x1.GetDiameter(), x1.GetArea());
Console.WriteLine("Radious({0}), Diameter({1}), Area({2})", x2.GetRadious(), x2.GetDiameter(), x2.GetArea());
Console.WriteLine("Radious({0}), Diameter({1}), Area({2})", x3.GetRadious(), x3.GetDiameter(), x3.GetArea());
}
}
}

class Circle
{
int radious;
int diameter;
double area;

public Circle()
{
radious = 1;
ComputeDiameter(); //place1
ComputeArea(); //place1
}
public void ComputeDiameter()
{
diameter = 2 * radious;
}
public void ComputeArea()
{
area = 3.14 * radious * radious;
}

public int GetRadious()
{
return this.radious;
}
public void SetRadious(int radious)
{
this.radious = radious;
ComputeDiameter(); //place2
ComputeArea(); //place2
}

public int GetDiameter()
{
return this.diameter;
}

public double GetArea()
{
return this.area;
}
}