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Re: ajuda

   AO passa por O',o centro da face BCD.Como BO' e CO' sao perprndiculares a
reta AO=AO' (pois esta reta e' perpendicular ao plano BCD) ,que e' a
intersecao dos planos OAB e OAC,o angulo diedrico e' BO'C=120 graus.

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>O tetraedro regular ABCD tem centro O. Quanto mede o =E2ngulo diedro de face=
>s=20
>OAB e OAC?
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><HTML><FONT FACE=3Darial,helvetica><FONT  SIZE=3D2>O tetraedro regular ABCD=20=
>tem centro O. Quanto mede o =E2ngulo diedro de faces OAB e OAC?</FONT></HTML=
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