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I thought you might be interested in looking at حساب البعد الزاوي.
http://forum.qasweb.org/index.php?/topic/2648-%D8%AD%D8%B3%D8%A7%D8%A8-%D8%A7%D9%84%D8%A8%D8%B9%D8%AF-%D8%A7%D9%84%D8%B2%D8%A7%D9%88%D9%8A/&do=findComment&comment=8266
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