Математика
выполните самостоятельную работу
1. Закончите предложение
а) прямая называется перпендикулярной плоскости,
если она
б) если две прямые перпендикулярны плоскости, то
А
в) две плоскости называются перпендикулярными,
если
2. Запишите признак перпендикулярности прямой и плоскости
3. Запишите теорему о трёх перпендикулярах.
4. Запишите признак перпендикулярности двух
Плоскостей.
5. Дан треугольник ABC. Плоскость, параллельная
прямой AB, пересекает сторону AC в точке К, а
сторону ВС в точке М. Докажите, что прямая КМ
параллельная прямой AB. Найдите длину отрезка АВ,
если КС = 12 м, АС = 24 м, КМ = 9 м.
6. Точка 0 - центр квадрата со стороной 8 см. ОМ -
перпендикуляр к плоскости квадрата длиной 3 см.
Найдите расстояние от точки M до стороны квадрата.
7. В прямоугольном параллелепипеде длины трёх рёбер, выходящих из одной вершины, равны 4 дм, 6дм и 12 дм. Найдите длины диагоналей
параллелепипеда.
8. В прямоугольном параллелепипеде
ABCDA,B,C,D, известно, что BD - √77,
BB1 = 5, A1D1 = 6. Найдите длину ребра АВ.​

In my neighborhood there is a park in what you can walk with your dog or hang out with a friend. There're huge trees and tight bushes all around. Beautiful benches are used for people to be comfortable to sit when they got tired and want to rest. In my neighborhood there's a huge attraction park. You can have a ride on a lot of attractions and have fun with friends making selfies. City has immense buildings and huge population. Also there're a lot of malls and supermarkets around streets. Town has a little smaller population and not a lot of malls. Rural area is area for farmers. It doesn't have big population or infrastructure, but has a lot of land for using. All farmers living in rural areas. Urban area is area on what located all cities. It has high buildings and huge population. Also people living not in their houses, but in apartments. I think that it depends on kind of personality. But all people that want to make big money living in urban areas. Because in cities there're much more job opportunities than in rural area.

Are Bill and Tom making a snowman?Yes,they are.

Is Mr.Jones playing in the snow?No,he isn't.

Is Mr.Jones talking to Bill?No,he isn't.

Are Bill and Tom eating sandwiches?No,they aren't.

Is Molly taking photographs?No,she isn't.

Is Tim eating a sandwich?Yes,he is.

9.

Is your teacher talking right now?No she isn't.

Are your parents working now?Yes,they are.

Are you having an English lesson now?Yes,I am.

Are your friends playing football now?

No,they aren't.

Are you wearing shorts now?

Yes,I am.

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