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C# code:

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;

namespace WindowsFormsApplication15
{
public partial class Form1 : Form
{
double R = 100;
Point PO;
Point OldMousePosition;

public Form1()
{
InitializeComponent();

this.LocationChanged += new EventHandler(F