Построй четырехугольник ABCD, если А (2; 3), В (2; 7), С (8; 7), D (8; 3). Определи вид этого четырехугольника.

Our country. Our environment. There are many big and small rivers, green forests, high mountains,I think people must take care of our Motherland.The international conventions pay mush attention to the control of population too. There are a lot of industrial enterprises in our country that"s why we can"t ignore the problem of the protection of our environment. We have got the main aim of the protection. Our environment must be clean.Тhere are many kinds of transport in our big cities, that is why we must pay attention to the protection of our nature and the health of the people.he other problem is an earthquakes in America. Our scientist try to forecast earthquakes, then we can protect ourselves from them. The people all over the world do everything to protect their nature, to make their country riches, do make their life happier.