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Задание 1. В прямоугольном треугольнике ABC из вершины прямого угла проведена высота СD. Определите длину СD, если АD = 4 см, АВ = 13 см.
Указание: для решения воспользуйтесь утверждением, что высота прямоугольного треугольника разбивает его на два треугольника, подобных друг другу.

Задание 3.
В треугольнике ABC проведена средняя линия KL (KL || AC). В полученном треугольнике BKL проведена средняя линия MN (MN || BK). Определите периметр треугольника АВС, если периметр треугольника MNL составляет 14 см.

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5. Make questions. Give short answers.

1)......................you get up 6 o'clock?-No,...............

2).......................he playing football?- Yes,...............

3)....................he get up at 8 o'clock?-No,....................

4)....................you doing your homework?-Yes,....................

5) -....................you do your homework every day?

    -Yes,....................

6)....................it often rain in Englaind?-Yes,....................

7)....................it rainin?- Yes,....................

8)....................it sometimes snow in March?-Yes,....................

9)....................it snowing?-Yes,....................

10).................... it cloudy mow?-Yes,....................

6 Make questions. Give short answers.

1)-........................................................salad?

-Yes,..............(He is eating salad)

2) -........................................................salad?

-Yes,...................................(He eats salad)

3) -....................................................... their homework at the moment?

-Yes,................(They are doing their homework at the moment)

4)-........................................................their homework after school?

-Yes,.......................(They do homework after school)

5) -.......................................................on the computer?

-Yes,...................(She is working on the computer)

6) -........................................................meat?

-Yes,..................... (She is cooking meat)

7)-........................................................meat?

-Yes,.......................(She cooks meat)

8)-........................................................mahy apples?

-Yes,................................(She has got a lot of apples)

9)-........................................................ a good time?

-Yes,...................(She had a good time)

10) -....................................................... five lessons tomorrow?

-Yes,....................(She will have five lessons tomorrow)

7 Complete the sentences. The Present Continuous or the Present Simple.

1) -I think she.............(cry)

-I am sure she is. She often..............(cry)

2) The little girl said to the Wolf: "My Granny...............(not/be) very well. I...............(take) her some nice things to eat".

3) I.......(talk) to you! You must listen to me!

4) Look! A cat............(run) across the stadium!

5) She.................(be) a good pupil. She always............(do) her work well.

6) I..............(think) he well come to see us.

7) Be quiet, please! I............(think) about this problem.

8) I........(think) they will be late.

9)Now I.............(want) to talk to you about the party.

10) What language............she...............(speak) nom?

I................(not/understand) anything.