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#2
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¶éÒÃ͵Ѵ¢¹Ò¹¡Ñº°Ò¹ ÊÒÁÒä鹷Ñ駷ÕèÁÒáÅÐÊÙµÃä´é¨Ò¡¡Ùà¡ÔÅâ´Â¤ÓÇèÒ truncated cone+surface area ¤ÃѺ ÁÕµÑé§ËÅÒ·Õè àªè¹ ˹éÒ¹ÕéËÃ×Í˹éÒ¹Õé áµèËÒ¡µÑ´äÁ袹ҹ¡Ñº°Ò¹¨Ð¤Ô´ÂÒ¡¡ÇèÒ¹Ñé¹àÂÍФÃѺ
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