31.5 треугольник авс лежыт в плоскости альфа .через его вершыны проведены паралельные прямые, которые пересикаються плоскостью бета , паралельную плоскости альфа в точках а1, в1,с1. найдите периметр триугольника а1в1с1 , если периметр треугольника авс равен 20см
I have just arrived on a new planet and want to talk some about my empression. Firstly, you need to know that this planet is very beautiful and it is very different from the Earth. It has green water instead of blue, and grass is red. My journey goes very good, it's a lot of interesting things here. I'm going to return home in a month. Also, there are very kind and smart people on this planet. They told me some cool facts about their home and even talked to me about some secrets of this place. Well, at the moment i feel peaceful. This journey gives me as much of good emotions as i can't write you about how i am happy. But on the other hand, i miss my home - the Earth.
Sorry, i cant write more, i need to help my new friends. How to hear from you soon.
All the best,
(Твое имя)
I have just arrived on a new planet and want to talk some about my empression. Firstly, you need to know that this planet is very beautiful and it is very different from the Earth. It has green water instead of blue, and grass is red. My journey goes very good, it's a lot of interesting things here. I'm going to return home in a month. Also, there are very kind and smart people on this planet. They told me some cool facts about their home and even talked to me about some secrets of this place. Well, at the moment i feel peaceful. This journey gives me as much of good emotions as i can't write you about how i am happy. But on the other hand, i miss my home - the Earth.
Sorry, i cant write more, i need to help my new friends. How to hear from you soon.
All the best,
(Твое имя)