3/3 Lectia 1313 Drepte si plane perpendiculare Teorema celor 3 perpendiculare Unghi diedru - Clasa 8
2/3 Lectia 1313 Drepte si plane perpendiculare Teorema celor 3 perpendiculare Unghi diedru - Clasa 8
1/3 Lectia 1313 Drepte si plane perpendiculare Teorema celor 3 perpendiculare Unghi diedru - Clasa 8