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Α΄ Γυμνασίου 1.9
Α΄ Γυμνασίου 1-9 Σχετικές θέσεις Ευθειών
Δύο ευθείες του ίδιου επιπέδου οι οποίες δεν έχουν κοινά σημεία λέγονται [b]παράλληλες[/b].