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Две прямые на плоскости называются параллельными, если они не пересекаются
Две прямые на плоскости называются перпендикулярными, если они пересекаются под прямым углом
Если прямые не пересекаются и не параллельны, то они не лежат в одной плоскости
Если прямые имеют общую точку то говорят, что эти прямые пересекаются
Отрезок и прямая называются параллельными, если отрезок лежит на параллельной прямой
Если прямая пересекает одну из двух параллельных прямых , то она пересекает и другую
Created by: Tanya1
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