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ПРИЗНАКИ ПАР-СТИ

ПРИЗНАКИ РАВЕНСТВА Т

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Если при пересечении двух прямых секущей накрест лежащие углы равны, то прямые параллельны. 1 признак параллельности прямых
Если при пересечении двух прямых секущей соответственные углы равны, то прямые параллельны. 2 признак параллельности прямых
Если при пересечении двух прямых секущей сумма односторонних углов равна 180 градусов, то прямые параллельны. 3 признак параллельности прямых
Через точку, не лежащую на данной прямой, проходит только одна прямая, параллельная данной. аксиома параллельных прямых
Если две параллельные прямые пересечены секущей , то накрест лежащие углы равны. свойство параллельных прямых
Если две прямые параллельны третьей, то они параллельны. следствие из аксиомы параллельных прямых
Две прямые на плоскости называются параллельными, если они не пересекаются. определение параллельных прямых
Created by: zolotko
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