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         <title><![CDATA[23) GEOMETRIE SINTETICA IN SPATIU]]></title>
        <description><![CDATA[Definiţii, teoreme şi formule utile pentru&nbsp;calculul lungimilor,&nbsp;măsurilor de unghiuri, ariilor şi volumelor, legate de&nbsp;corpurile geometrice studiate &icirc;n gimnaziu şi liceu.&nbsp;]]></description>
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					<title><![CDATA[TEORIE]]></title>
					<description><![CDATA[&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Definitie: O dreapta este perpendiculara pe un plan daca este perpendiculara pe orice dreapta din acel plan. &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Teorema: $latex Daca##; o##; dreapta##; este##; perpendiculara$ $lat...]]></description>
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					<pubDate>Thu, 19 Feb 2009 23:29:11 +0200</pubDate>
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