The paragraph was scrambled by saving as code page 1256 (Arabic/Persian), then interpreted as code page 1252 (Western Europe), and finally saved as Unicode text. You can use C# to reverse this procedure:
string scrambled = "Êæ Çíä ÓæÑÓ ÈÑäÇãå ÚÏÏ ÏáÎæÇåí Ñæ ÇÒ æÑæÏí ãííÑå æ " +
"Èå Øæá åãæä ÚÏÏ ãËáËí Ñæ ÑÓã ãí ˜äå";
byte[] bytes = Encoding.GetEncoding("windows-1252").GetBytes(scrambled);
string plainText = Encoding.GetEncoding("windows-1256").GetString(bytes);
Console.WriteLine(text);
The plain text output is: "تو اين سورس برنامه عدد دلخواهي رو از ورودي ميگيره و به طول همون عدد مثلثي رو رسم مي کنه"