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Clasa VIII 2007-2008

 
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alex2008
Leibniz


Joined: 19 Oct 2008
Posts: 489
Location: Tulcea

PostPosted: Sat Dec 20, 2008 7:57 pm    Post subject: Clasa VIII 2007-2008 Reply with quote

Se da un patrat ABCD si triunghiul CDE situate in plane diferite . Unghiul CDE este drept , iar punctele M si N sunt mijloacele laturilor CE , respectiv DE . Fie punctul O centrul patratului .
a)Calculati masura unghiului dintre dreptele BC si MN .
b)Aratati ca dreapta MN este perpendiculara pe planul(ADE) .
c)Aratati ca dreapta AE este paralela cu planul (MNO) .
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