Выберите верные утверждения:

1) Через точку, не лежащую на данной прямой, проходит только одна прямая параллельная данной.

2) Если две прямые параллельны третьей прямой, то они перпендикулярны

3) Через точку, не лежащую на данной прямой, проходит множество прямых, параллельных данной.

4) Если при пересечении двух прямых секущей, соответственные углы равны, то прямые параллельны​

1. Отношением отрезков AB и CD называется отношение их длин.

2. В треугольниках сходственными сторонами называются те стороны, которые лежат напротив их равных углов.

3. Коэффициентом подобия треугольников называется отношение сходственных сторон подобных треугольников.

4. в) BD/AC=DC/AB

5. Отношение периметров подобных треугольников равно коэффициенту подобия.
1,4 м = 140 см.
k=BC/B₁C₁ = 140/56 = 2.5
ответ: а) 2,5

6. б) параллельной какой-либо стороне 

7. Отношение высот, проведенных к сходственным сторонам подобных треугольников равно отношению сходственных сторон.

8. б) отношению их площадей

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Объяснение:

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