Section b. Some Geometrical Figures. Lead-in

I. Is Geometry a very important subject for engineering? Name the most important geometrical figures.

II. Now let's revise some geometrical figures.

1.	Number 1 is a point. This is a point. What is this? This is a point.
2.	What is number 2? Number 2 is a line. What is that? That is a line. That line is straight.
3.	What is this? This is a curve. Is this a curve? Yes, it is. Is it open? Yes, it is.
4.	What are these? These are circles. Are these circles? Yes, they are. These circles are large. Are these circles large? Yes, they are.
5.	What are those? Those are squares. Those are squares, aren't they? Yes, they are. They are squares. Those squares are small.

Language Practice

I. Change singular into plural and plural into singular.

1. This is a tyre.

2. Those are pipes.

3. That is a wheel.

4. These are acute angles.

5. This is a straight line.

6. Those are matches.

II. A) Study this picture and learn the names of different tools.

b) Close the book and try to name as many tools as possible.

III. Make up sentences with the following expressions: a pair of, a set of, a box of, a packet of.

Example: a) pliers These are pliers. This is a pair of pliers.

a) pliers b) pincers c) scissors d) goggles e) glasses

f) spanners g) screwdrivers h) chisels i) rulers

j) tools k) matches l) drills

m) nails n) screws o) nuts p) bolts

IV. Look at the chart below. Choose the right tool for each profession.

Example: A screwdriver is for electricians. Screwdrivers are for electricians.

pliers spanner screwdriver chisel ruler nails screws nuts bolts

is are

for

electricians carpenters mechanics joiners

V. Find and correct mistakes in the following sentences.

1. – What is it? – This is curves.

2. – Are these containers full of water? – Yes, them are.

3. This chisels are new.

4. We are two-year students.

5. These are a set of screwdrivers.

6. Is this a pair of spanneres?

VI. Translate the following sentences.

1. Это квадрат.

2. Те трубы длинные.

3. – Что это? – Это шина. Она узкая.

4. Это колеса. Они большие.

5. Другими словами, этот угол прямой.

6. Это линия? – Правильно. Эта линия прямая.

7. Это тоже угол, но он острый.

8. Что это? – Это плоскости. Они параллельные.

9. Это кривые, не так ли?

10. Эти емкости полные.

Reading and Speaking

I. Read the texts and answer the questions.

1. Number 1 is an angle. This is an angle. It is acute. In other words this angle is acute. 1. What is this? 2. Is it an acute angle?	2. Number 2 is also an angle. That is also an angle. But it is not acute. It is right. In other words that angle is a right angle. 1. What is that? 2. Is it also an acute angle? 3. It is a right angle, isn't it?		3. Number 3 is an angle as well. That is also an angle. But it is neither acute nor right. It is obtuse. Thus that angle is an obtuse angle. 1. What is that? 2. Is it a right angle? 3. It is an obtuse angle, isn't it?
4.		5.
All these are curves. These are simple curves. They are simple open and closed curves. In other words these curves are simple open and closed. 1. What are all these? 2. Are they simple curves? 3. These curves arc simple open and closed, aren't they?		Those are planes. Those are parallel planes. They are parallel. So those planes are parallel. 1. What are these? 2. Are they parallel planes? 3. Those planes are parallel, aren't they?